QlineEdit widget not displayed according to QTDesigner definition

Question

I'm still practicing with pyQT5 and I'm facing this issue: I created a form with QTDesigner and then converted in .py using pyuic5. Now, if I preview the form in QTDesigner, it looks like the first image shown below (which is OK).

After the conversion in .py, when I launch the program, it looks like the second image shown below where the 2 fields 'Descrizione CDL' and 'Descrizione' are not displayed correctly. As I simply converted the file without changing anything in the code, I don't have any idea why the form looks like different.

I post also the code even though it's the pure result of the conversion from .ui to .py as no changes have been made.

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_Form(object):
    def setupUi(self, Form):
        Form.setObjectName("Form")
        Form.resize(776, 459)
        self.widget = QtWidgets.QWidget(Form)
        self.widget.setGeometry(QtCore.QRect(13, 13, 721, 434))
        self.widget.setObjectName("widget")
        self.verticalLayout = QtWidgets.QVBoxLayout(self.widget)
        self.verticalLayout.setContentsMargins(0, 0, 0, 0)
        self.verticalLayout.setObjectName("verticalLayout")
        self.formLayout = QtWidgets.QFormLayout()
        self.formLayout.setLabelAlignment(QtCore.Qt.AlignLeading|QtCore.Qt.AlignLeft|QtCore.Qt.AlignVCenter)
        self.formLayout.setFormAlignment(QtCore.Qt.AlignLeading|QtCore.Qt.AlignLeft|QtCore.Qt.AlignTop)
        self.formLayout.setObjectName("formLayout")
        self.label = QtWidgets.QLabel(self.widget)
        self.label.setObjectName("label")
        self.formLayout.setWidget(0, QtWidgets.QFormLayout.LabelRole, self.label)
        self.lE_cdl = QtWidgets.QLineEdit(self.widget)
        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Fixed, QtWidgets.QSizePolicy.Fixed)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(self.lE_cdl.sizePolicy().hasHeightForWidth())
        self.lE_cdl.setSizePolicy(sizePolicy)
        self.lE_cdl.setObjectName("lE_cdl")
        self.formLayout.setWidget(0, QtWidgets.QFormLayout.FieldRole, self.lE_cdl)
        self.label_2 = QtWidgets.QLabel(self.widget)
        self.label_2.setObjectName("label_2")
        self.formLayout.setWidget(1, QtWidgets.QFormLayout.LabelRole, self.label_2)
        self.lE_descCDL = QtWidgets.QLineEdit(self.widget)
        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Fixed)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(self.lE_descCDL.sizePolicy().hasHeightForWidth())
        self.lE_descCDL.setSizePolicy(sizePolicy)
        self.lE_descCDL.setSizeIncrement(QtCore.QSize(1000, 0))
        self.lE_descCDL.setMaxLength(32767)
        self.lE_descCDL.setObjectName("lE_descCDL")
        self.formLayout.setWidget(1, QtWidgets.QFormLayout.FieldRole, self.lE_descCDL)
        self.label_3 = QtWidgets.QLabel(self.widget)
        self.label_3.setObjectName("label_3")
        self.formLayout.setWidget(2, QtWidgets.QFormLayout.LabelRole, self.label_3)
        self.lE_tipo = QtWidgets.QLineEdit(self.widget)
        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Fixed, QtWidgets.QSizePolicy.Fixed)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(self.lE_tipo.sizePolicy().hasHeightForWidth())
        self.lE_tipo.setSizePolicy(sizePolicy)
        self.lE_tipo.setObjectName("lE_tipo")
        self.formLayout.setWidget(2, QtWidgets.QFormLayout.FieldRole, self.lE_tipo)
        self.label_5 = QtWidgets.QLabel(self.widget)
        self.label_5.setObjectName("label_5")
        self.formLayout.setWidget(3, QtWidgets.QFormLayout.LabelRole, self.label_5)
        self.lE_desc2 = QtWidgets.QLineEdit(self.widget)
        self.lE_desc2.setObjectName("lE_desc2")
        self.formLayout.setWidget(3, QtWidgets.QFormLayout.FieldRole, self.lE_desc2)
        self.label_4 = QtWidgets.QLabel(self.widget)
        self.label_4.setObjectName("label_4")
        self.formLayout.setWidget(4, QtWidgets.QFormLayout.LabelRole, self.label_4)
        self.dSB_costi = QtWidgets.QDoubleSpinBox(self.widget)
        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Fixed, QtWidgets.QSizePolicy.Fixed)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(self.dSB_costi.sizePolicy().hasHeightForWidth())
        self.dSB_costi.setSizePolicy(sizePolicy)
        self.dSB_costi.setObjectName("dSB_costi")
        self.formLayout.setWidget(4, QtWidgets.QFormLayout.FieldRole, self.dSB_costi)
        self.label_7 = QtWidgets.QLabel(self.widget)
        self.label_7.setObjectName("label_7")
        self.formLayout.setWidget(5, QtWidgets.QFormLayout.LabelRole, self.label_7)
        self.sB_troncone = QtWidgets.QSpinBox(self.widget)
        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Fixed, QtWidgets.QSizePolicy.Fixed)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(self.sB_troncone.sizePolicy().hasHeightForWidth())
        self.sB_troncone.setSizePolicy(sizePolicy)
        self.sB_troncone.setObjectName("sB_troncone")
        self.formLayout.setWidget(5, QtWidgets.QFormLayout.FieldRole, self.sB_troncone)
        self.label_6 = QtWidgets.QLabel(self.widget)
        self.label_6.setObjectName("label_6")
        self.formLayout.setWidget(6, QtWidgets.QFormLayout.LabelRole, self.label_6)
        self.sB_barra_utile = QtWidgets.QSpinBox(self.widget)
        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Fixed, QtWidgets.QSizePolicy.Fixed)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(self.sB_barra_utile.sizePolicy().hasHeightForWidth())
        self.sB_barra_utile.setSizePolicy(sizePolicy)
        self.sB_barra_utile.setObjectName("sB_barra_utile")
        self.formLayout.setWidget(6, QtWidgets.QFormLayout.FieldRole, self.sB_barra_utile)
        self.label_9 = QtWidgets.QLabel(self.widget)
        self.label_9.setObjectName("label_9")
        self.formLayout.setWidget(7, QtWidgets.QFormLayout.LabelRole, self.label_9)
        self.sB_sovrametallo = QtWidgets.QSpinBox(self.widget)
        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Fixed, QtWidgets.QSizePolicy.Fixed)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(self.sB_sovrametallo.sizePolicy().hasHeightForWidth())
        self.sB_sovrametallo.setSizePolicy(sizePolicy)
        self.sB_sovrametallo.setObjectName("sB_sovrametallo")
        self.formLayout.setWidget(7, QtWidgets.QFormLayout.FieldRole, self.sB_sovrametallo)
        self.label_8 = QtWidgets.QLabel(self.widget)
        self.label_8.setObjectName("label_8")
        self.formLayout.setWidget(8, QtWidgets.QFormLayout.LabelRole, self.label_8)
        self.dSB_cambio_utensile = QtWidgets.QDoubleSpinBox(self.widget)
        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Fixed, QtWidgets.QSizePolicy.Fixed)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(self.dSB_cambio_utensile.sizePolicy().hasHeightForWidth())
        self.dSB_cambio_utensile.setSizePolicy(sizePolicy)
        self.dSB_cambio_utensile.setObjectName("dSB_cambio_utensile")
        self.formLayout.setWidget(8, QtWidgets.QFormLayout.FieldRole, self.dSB_cambio_utensile)
        self.label_11 = QtWidgets.QLabel(self.widget)
        self.label_11.setObjectName("label_11")
        self.formLayout.setWidget(9, QtWidgets.QFormLayout.LabelRole, self.label_11)
        self.sSB_tempo_carico_auto = QtWidgets.QDoubleSpinBox(self.widget)
        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Fixed, QtWidgets.QSizePolicy.Fixed)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(self.sSB_tempo_carico_auto.sizePolicy().hasHeightForWidth())
        self.sSB_tempo_carico_auto.setSizePolicy(sizePolicy)
        self.sSB_tempo_carico_auto.setObjectName("sSB_tempo_carico_auto")
        self.formLayout.setWidget(9, QtWidgets.QFormLayout.FieldRole, self.sSB_tempo_carico_auto)
        self.label_10 = QtWidgets.QLabel(self.widget)
        self.label_10.setObjectName("label_10")
        self.formLayout.setWidget(10, QtWidgets.QFormLayout.LabelRole, self.label_10)
        self.dSB_tempo_rip_cre_2pass = QtWidgets.QDoubleSpinBox(self.widget)
        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Fixed, QtWidgets.QSizePolicy.Fixed)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(self.dSB_tempo_rip_cre_2pass.sizePolicy().hasHeightForWidth())
        self.dSB_tempo_rip_cre_2pass.setSizePolicy(sizePolicy)
        self.dSB_tempo_rip_cre_2pass.setObjectName("dSB_tempo_rip_cre_2pass")
        self.formLayout.setWidget(10, QtWidgets.QFormLayout.FieldRole, self.dSB_tempo_rip_cre_2pass)
        self.label_13 = QtWidgets.QLabel(self.widget)
        self.label_13.setObjectName("label_13")
        self.formLayout.setWidget(11, QtWidgets.QFormLayout.LabelRole, self.label_13)
        self.dSB_tempo_rip_cre_car_man = QtWidgets.QDoubleSpinBox(self.widget)
        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Fixed, QtWidgets.QSizePolicy.Fixed)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(self.dSB_tempo_rip_cre_car_man.sizePolicy().hasHeightForWidth())
        self.dSB_tempo_rip_cre_car_man.setSizePolicy(sizePolicy)
        self.dSB_tempo_rip_cre_car_man.setObjectName("dSB_tempo_rip_cre_car_man")
        self.formLayout.setWidget(11, QtWidgets.QFormLayout.FieldRole, self.dSB_tempo_rip_cre_car_man)
        self.label_12 = QtWidgets.QLabel(self.widget)
        self.label_12.setObjectName("label_12")
        self.formLayout.setWidget(12, QtWidgets.QFormLayout.LabelRole, self.label_12)
        self.sB_nr_giri_max = QtWidgets.QSpinBox(self.widget)
        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Fixed, QtWidgets.QSizePolicy.Fixed)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(self.sB_nr_giri_max.sizePolicy().hasHeightForWidth())
        self.sB_nr_giri_max.setSizePolicy(sizePolicy)
        self.sB_nr_giri_max.setObjectName("sB_nr_giri_max")
        self.formLayout.setWidget(12, QtWidgets.QFormLayout.FieldRole, self.sB_nr_giri_max)
        self.pb_conf = QtWidgets.QPushButton(self.widget)
        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Fixed, QtWidgets.QSizePolicy.Fixed)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(self.pb_conf.sizePolicy().hasHeightForWidth())
        self.pb_conf.setSizePolicy(sizePolicy)
        font = QtGui.QFont()
        font.setBold(True)
        self.pb_conf.setFont(font)
        self.pb_conf.setAutoFillBackground(False)
        self.pb_conf.setStyleSheet("background-color: rgb(0, 144, 81);")
        self.pb_conf.setObjectName("pb_conf")
        self.formLayout.setWidget(13, QtWidgets.QFormLayout.FieldRole, self.pb_conf)
        self.verticalLayout.addLayout(self.formLayout)

        self.retranslateUi(Form)
        QtCore.QMetaObject.connectSlotsByName(Form)

    def retranslateUi(self, Form):
        _translate = QtCore.QCoreApplication.translate
        Form.setWindowTitle(_translate("Form", "Inserimento Risorse Interne"))
        self.label.setText(_translate("Form", "Centro di lavoro (CDL)"))
        self.label_2.setText(_translate("Form", "Descrizione CDL"))
        self.label_3.setText(_translate("Form", "Tipo"))
        self.label_5.setText(_translate("Form", "Descrizione 2"))
        self.label_4.setText(_translate("Form", "Costi"))
        self.label_7.setText(_translate("Form", "Troncone (mm)"))
        self.label_6.setText(_translate("Form", "Barra utile (mm)"))
        self.label_9.setText(_translate("Form", "Sovrametallo per taglio (mm)"))
        self.label_8.setText(_translate("Form", "Cambio utensile (s)"))
        self.label_11.setText(_translate("Form", "Tempo carico e scarico automatico (s)"))
        self.label_10.setText(_translate("Form", "Tempo riposiz. Creatore per 2° passate (s)"))
        self.label_13.setText(_translate("Form", "Tempo riposiz. Creatore per caricamento MANUALE"))
        self.label_12.setText(_translate("Form", "n° di giri max (RPM)"))
        self.pb_conf.setText(_translate("Form", "Conferma "))


if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    Form = QtWidgets.QWidget()
    ui = Ui_Form()
    ui.setupUi(Form)
    Form.show()
    sys.exit(app.exec_())

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>Form</class>
 <widget class="QWidget" name="Form">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>776</width>
    <height>459</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>Inserimento Risorse Interne</string>
  </property>
  <widget class="QWidget" name="">
   <property name="geometry">
    <rect>
     <x>13</x>
     <y>13</y>
     <width>721</width>
     <height>434</height>
    </rect>
   </property>
   <layout class="QVBoxLayout" name="verticalLayout">
    <item>
     <layout class="QFormLayout" name="formLayout">
      <property name="fieldGrowthPolicy">
       <enum>QFormLayout::ExpandingFieldsGrow</enum>
      </property>
      <property name="labelAlignment">
       <set>Qt::AlignLeading|Qt::AlignLeft|Qt::AlignVCenter</set>
      </property>
      <property name="formAlignment">
       <set>Qt::AlignLeading|Qt::AlignLeft|Qt::AlignTop</set>
      </property>
      <item row="0" column="0">
       <widget class="QLabel" name="label">
        <property name="text">
         <string>Centro di lavoro (CDL)</string>
        </property>
       </widget>
      </item>
      <item row="0" column="1">
       <widget class="QLineEdit" name="lE_cdl">
        <property name="sizePolicy">
         <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
          <horstretch>0</horstretch>
          <verstretch>0</verstretch>
         </sizepolicy>
        </property>
       </widget>
      </item>
      <item row="1" column="0">
       <widget class="QLabel" name="label_2">
        <property name="text">
         <string>Descrizione CDL</string>
        </property>
       </widget>
      </item>
      <item row="1" column="1">
       <widget class="QLineEdit" name="lE_descCDL">
        <property name="sizePolicy">
         <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
          <horstretch>0</horstretch>
          <verstretch>0</verstretch>
         </sizepolicy>
        </property>
        <property name="sizeIncrement">
         <size>
          <width>1000</width>
          <height>0</height>
         </size>
        </property>
        <property name="maxLength">
         <number>32767</number>
        </property>
       </widget>
      </item>
      <item row="2" column="0">
       <widget class="QLabel" name="label_3">
        <property name="text">
         <string>Tipo</string>
        </property>
       </widget>
      </item>
      <item row="2" column="1">
       <widget class="QLineEdit" name="lE_tipo">
        <property name="sizePolicy">
         <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
          <horstretch>0</horstretch>
          <verstretch>0</verstretch>
         </sizepolicy>
        </property>
       </widget>
      </item>
      <item row="3" column="0">
       <widget class="QLabel" name="label_5">
        <property name="text">
         <string>Descrizione 2</string>
        </property>
       </widget>
      </item>
      <item row="3" column="1">
       <widget class="QLineEdit" name="lE_desc2"/>
      </item>
      <item row="4" column="0">
       <widget class="QLabel" name="label_4">
        <property name="text">
         <string>Costi</string>
        </property>
       </widget>
      </item>
      <item row="4" column="1">
       <widget class="QDoubleSpinBox" name="dSB_costi">
        <property name="sizePolicy">
         <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
          <horstretch>0</horstretch>
          <verstretch>0</verstretch>
         </sizepolicy>
        </property>
       </widget>
      </item>
      <item row="5" column="0">
       <widget class="QLabel" name="label_7">
        <property name="text">
         <string>Troncone (mm)</string>
        </property>
       </widget>
      </item>
      <item row="5" column="1">
       <widget class="QSpinBox" name="sB_troncone">
        <property name="sizePolicy">
         <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
          <horstretch>0</horstretch>
          <verstretch>0</verstretch>
         </sizepolicy>
        </property>
       </widget>
      </item>
      <item row="6" column="0">
       <widget class="QLabel" name="label_6">
        <property name="text">
         <string>Barra utile (mm)</string>
        </property>
       </widget>
      </item>
      <item row="6" column="1">
       <widget class="QSpinBox" name="sB_barra_utile">
        <property name="sizePolicy">
         <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
          <horstretch>0</horstretch>
          <verstretch>0</verstretch>
         </sizepolicy>
        </property>
       </widget>
      </item>
      <item row="7" column="0">
       <widget class="QLabel" name="label_9">
        <property name="text">
         <string>Sovrametallo per taglio (mm)</string>
        </property>
       </widget>
      </item>
      <item row="7" column="1">
       <widget class="QSpinBox" name="sB_sovrametallo">
        <property name="sizePolicy">
         <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
          <horstretch>0</horstretch>
          <verstretch>0</verstretch>
         </sizepolicy>
        </property>
       </widget>
      </item>
      <item row="8" column="0">
       <widget class="QLabel" name="label_8">
        <property name="text">
         <string>Cambio utensile (s)</string>
        </property>
       </widget>
      </item>
      <item row="8" column="1">
       <widget class="QDoubleSpinBox" name="dSB_cambio_utensile">
        <property name="sizePolicy">
         <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
          <horstretch>0</horstretch>
          <verstretch>0</verstretch>
         </sizepolicy>
        </property>
       </widget>
      </item>
      <item row="9" column="0">
       <widget class="QLabel" name="label_11">
        <property name="text">
         <string>Tempo carico e scarico automatico (s)</string>
        </property>
       </widget>
      </item>
      <item row="9" column="1">
       <widget class="QDoubleSpinBox" name="sSB_tempo_carico_auto">
        <property name="sizePolicy">
         <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
          <horstretch>0</horstretch>
          <verstretch>0</verstretch>
         </sizepolicy>
        </property>
       </widget>
      </item>
      <item row="10" column="0">
       <widget class="QLabel" name="label_10">
        <property name="text">
         <string>Tempo riposiz. Creatore per 2° passate (s)</string>
        </property>
       </widget>
      </item>
      <item row="10" column="1">
       <widget class="QDoubleSpinBox" name="dSB_tempo_rip_cre_2pass">
        <property name="sizePolicy">
         <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
          <horstretch>0</horstretch>
          <verstretch>0</verstretch>
         </sizepolicy>
        </property>
       </widget>
      </item>
      <item row="11" column="0">
       <widget class="QLabel" name="label_13">
        <property name="text">
         <string>Tempo riposiz. Creatore per caricamento MANUALE</string>
        </property>
       </widget>
      </item>
      <item row="11" column="1">
       <widget class="QDoubleSpinBox" name="dSB_tempo_rip_cre_car_man">
        <property name="sizePolicy">
         <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
          <horstretch>0</horstretch>
          <verstretch>0</verstretch>
         </sizepolicy>
        </property>
       </widget>
      </item>
      <item row="12" column="0">
       <widget class="QLabel" name="label_12">
        <property name="text">
         <string>n° di giri max (RPM)</string>
        </property>
       </widget>
      </item>
      <item row="12" column="1">
       <widget class="QSpinBox" name="sB_nr_giri_max">
        <property name="sizePolicy">
         <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
          <horstretch>0</horstretch>
          <verstretch>0</verstretch>
         </sizepolicy>
        </property>
       </widget>
      </item>
      <item row="13" column="1">
       <widget class="QPushButton" name="pb_conf">
        <property name="sizePolicy">
         <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
          <horstretch>0</horstretch>
          <verstretch>0</verstretch>
         </sizepolicy>
        </property>
        <property name="font">
         <font>
          <bold>true</bold>
         </font>
        </property>
        <property name="autoFillBackground">
         <bool>false</bool>
        </property>
        <property name="styleSheet">
         <string notr="true">background-color: rgb(0, 144, 81);</string>
        </property>
        <property name="text">
         <string>Conferma </string>
        </property>
       </widget>
      </item>
     </layout>
    </item>
   </layout>
  </widget>
 </widget>
 <resources/>
 <connections/>
</ui>