Hmm... I got some more data on this, but no solution.
I did a factory reset and that made everything work again (I had the stock ROM from Google). Well, it worked with one finger. But i had some random touches that were not registered sometimes, not too annoying, but more frequent than before the screen repair. I flashed to CyanogenMod and it still worked as before.
Then I encrypted the phone and after rebooting the touch worked fine on decrypt screen, but not when I entered the main OS. So, going back to encryption (which I had before factory reset for the first time) introduced the problem again. Thus I think this problem is only present on my phone if I encrypt it.
Did factory reset again and it works... Any solution to this so I can have it working AND have my phone encrypted would be nice.