Modx touch screen

Hi, I had problems with the touch screen on my MODX6 screen, as when I touched the screen, the input it would recognize would be 4-5 cm at the left fro the spot I pointed.

I purchased a new touchscreen, and worked well for 30 mins but after it had the same error.

Hence I am not sure whether it is the touchscreen the problem or not, as it would be 2 screens with the exact same failure now.

Any idea what else could be the issue?

Thanks a lot in advance!