Post OmniRom on Samsung Galaxy SII GT-I9100G bug report

Since a few days I use OmniRom on my I9100G. The ROM works great so far. I've updated it daily.
But there is a grafic bug when I reboot the phone. When the phone forces me to enter the code for my simcard the numbers on the number block are cut off in the middle.
Entering the pin works, but ist does not look good because of the bug.