Qt Designer: Alignment property moves to wrong place in property editor

After some time using the Designer in QT Creator or QT Designer, the alignment field will be written in other places and prevent modification of the real value in the field.

Steps to reproduce:

• Open attached form
• In the property editor (mainwindow selected), scroll down and select "windowIcon"
• Focus Object inspector, press "Cursor down" key until last widget is shown
• Press "Cursor up" key until mainwindow is again selected
• Note the "windowIcon" property displays sth like "AlignLeft, AlignCenter"
• Editing works normal