Show some code... or attach a little sample that replicate the problem you have.

Also are you creating the layouts with Designer or code?
If you use the Designer apply a layout by selecting the "form" in the "background" of the QLabel, QLineEdit and other QWidgets.
If you are creating with code make sure that the layout is properly parented, i meant that you have a QWidget to act as a "form" and this is the parent to layout and this will be the widget you show()...