7" Touch Screen not accurate on right side

My new 7" latte panda touch screen overlay does not work very well. It is accurate on the left side of the screen, however, on the right side when I touch the screen recognizes a touch about 1" to the right of the actual touch. I have tried to calibrate, I have tried both the 1.0 and 1.1 drivers with no resolve. I have read alot of posts with similar issue, but I have not found any answers of how to correct. Please help me.