I have a rooted Homtom HT7 with stock rom and TWRP. It has worked well for more than 1 year but suddenly the touch screen has this strange behavior.
In this image, I was sliding my finger from left to the right and point goes way off from where i was touching.
I don't think the screen is broken because when I boot into TWRP the screen works well. Factory reset also fix this issue but only for a few days.
This happens without any clear reason. Sometimes I'm using the phone and it happens then after some time (or days) the touch is normal again then the issue comes back again.