Print element does not print the page with the print button, but choosing the data does print it

Question

There is a print button in my page, where it opens a popup. If I choose the text, it prints it. But, if I press the print button, it prints 2 blank pages. I tried printing other pages in the application, and they print normally. It's only the specific pop up that has the printing issue.

The code is typical, there are no errors in it:

ControlHandlers.GridPrint = function(iRecType, sIDs) {
    setTimeout(function() {
          try {
            if (MenuFolders.AppMode == 2) {
              $("#CalendarContainerDiv").printElement();
            }
            if (MenuFolders.AppMode == 3) {
              $("#ActivitiesDiv").printElement();
            }
            if (MenuFolders.AppMode == 4) {
              $("#ContactsDiv").printElement();
            }
            if (MenuFolders.AppMode == 5) {
              if (mo_CustomPage == true) {
                //PrintElem("ReportsContainerDiv");
                $("#ReportsDivEmpty").printElement();
                //   window.print();
                return;
              }

              if (!sIDs) {
                sIDs = '';
              }

              if (!sIDs != '') {
                var keys = BIGrid.getSelectedRowKeys();
                if (keys.length > 0) {
                  for (i = 0; i < keys.length; i++) {
                    if (sIDs != '') {
                      sIDs = sIDs + ','
                    };
                    sIDs = sIDs + keys[i].toString();
                  }
                } else {
                  ODCloseBusy();
                  ODAlert(ODGetMsg(2368));
                  return;
                }
              }

              if (iRecType == 1) {
                var query = {
                  iObjectID: BIObjectID,
                  iRecType: 1,
                  sIDs: sIDs
                };

                ODShowBusyWindow();

                FileWindow = true;
                //ShowReport("Download.html?v=2");

                //if (app.isMobileView()) {
                //    FileWindow = window.open("Download.html?v=2", "_blank");
                //} else {
                //    var sParams = "directories=no,titlebar=no,toolbar=no,location=no,status=no,menubar=no,width=" + Math.round(screen.width / 1.5) + ", height=" + Math.round(screen.height / 1.5) + ", top=" + ((screen.height / 2) - (screen.height / 1.5 / 2)) + ", left=" + ((screen.width / 2) - (screen.width / 1.5 / 2));
                //    FileWindow = window.open("Download.html?v=3", ODGetMsg(27), sParams);
                //}

                $.ajax({
                  type: "POST",
                  url: "WebMethods.aspx/WaitProcess",
                  //headers: { "Accept-Encoding": "gzip" },
                  data: JSON.stringify(query),
                  contentType: "application/json; charset=utf-8",
                  dataType: "json",
                  async: true,
                  success: function(result) {
                    var sData;
                    sData = eval('(' + result.d + ')');

                    if (sData.err != "") {
                      ODAlertError(sData.err);
                      ODCloseBusy();
                      return;
                    }

                    DownloadFile(sData.data, "-1", "");

                    ODCloseBusy();
                  },
                  failure: function(msg) {
                    ODCloseBusy();
                    ODAlertError(msg);
                  },
                  error: function(a, b, c) {
                    ODCloseBusy();
                    ODAlertError(c + ' - ' + a.responseText);
                  }
                });

                return;
              }; //EKTYPWSH LISTAS

              if (BIGridPrintField != '') {
                if (BIForcePrintFile != '') {
                  DownloadFile(BIForcePrintFile, "-1", "");
                  BIForcePrintFile = "";
                  return;
                }

                if (BIData && (BIData[BIGridPrintField] == '' || !BIData[BIGridPrintField])) {
                  ODAlertError(ODGetMsg(12061));
                } else {
                  var FilesToPrint = '';

                  var selectedRowsData = BIGrid.getSelectedRowsData();
                  for (i = 0; i < selectedRowsData.length; i++) {
                    if (FilesToPrint != '') {
                      FilesToPrint = FilesToPrint + '|'
                    };
                    if (selectedRowsData[i][BIGridPrintField] != '') {
                      FilesToPrint = FilesToPrint + selectedRowsData[i][BIGridPrintField];
                    }
                  }

                  //BIData[BIGridPrintField]
                  DownloadFile(FilesToPrint, "-1", "");
                }
              } else {
                $("#ReportsDiv").printElement();
              }
            }
          } catch (e) {
            ControlHandlers.ODAlertError(e);
          }