Whats wrong with using my touch pad while charging.

Whenever i try to use my laptop touchpad while it is on charge the cursor will bounce around the screen and select random things.

But when i take it of charge it is fine.

Then i will take it to another location eg. Someone elses house or even to the repairer and it works fine as well.

I've had the same problem in two different houses. And nobody knows how to fix it