Touchscreen going crazy on Mi a2 lite

Hello,

I have a problem with onjour touchscreen, sometime the screen bug and clic itself on the middle of the screen in line (the line where we can send message and add a word)

If i move the cable of the charger when it's plug, sometime the bug come and go.

Can you help me with this? I'm beginner in phone repair

By the way sorry for my english i'm not native :-(

I put a vidéo of the problem with the “dot on touch" of the dev menu