When I opened the "softkeys" for the first time, there was no problem, when I closed it and opened it the second time, strange thing came out: the button's height became smaller, and the charaters' position on the button seemed wrong. This not only happens to the button, but also many other controls. By the way, my device is Nokia 6120C.

I have this problem when I make some simple UI using Qt4.6. So then I uninstall my program in device and then check the demo. I found "softkeys" and "Fridge Magnets" and many other programs have similar problem.

Do you know what the problem is? I can provide the photos on this phenomenon on your further demand.