It’s a hardware issue. It’s called ghost touch which is when the screen on your device jumps around, fights against your touch and plain out annoying. To fix ghost touch you need to replace your screen, because something is damaged in the digitizer. Digitizer is what senses your touch to allow you to swipe and move things around.
The fix tutorial can be found here: https://www.youtube.com/watch?v=g6e5-H_UZO8
You need to watch from 0:10-3:00 to remove the screen successfully and then just reverse the steps you took to put it back together.
Replacement part can be found here: [product|IF239-073-2]