'Disproportionality between JFrame within the IDE and the same running

My problem is not so big, but it is annoying.

See my JFrame within my IDE (Netbeans 12.6):

(Pay attention to the distance of the text fields)

Now, see the same frame running:

Do you see the difference? This is too uncomfortable.

What do I do to make the distance of the elements equal in my running frame?

PS: the frame is set as non-resizable (maybe this info is useful).

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