Touch Screen

[Cactus]

Hey, jailbroke my itouch today and it's sick. I have a 3g itouch with greenposi0n and 4.2.1 firmware. I'm having an issue with certain programs. Certain programs have their aspect ration all out of whack. By aspect i mean when i click on the bottom left corner of my itouch, the top right is clicked. For example, in the youtube app, if i tocuh the bottom left corner, the expand button is pushed. So as it stands, i think the actual touchscreen has been moved down to the left. So, how do i fix this? safari and mail and other apps work, but some apps don't respond, reason being the screen is incorrectly positioned. how do i fix?