Capacitive Touchscreen affected when charging

My capacitive touchscreen keeps having ghost touches when the surface is charging and I touch the screen. Meaning like when I touch the screen with 1 finger, instead of just 1 touch detected, there are additional ghost touches on the screen as well. This only happens when I'm charging my Surface.

I was using my Surface fine but then one day my charger's wire frayed so badly that I needed to replace it. I first replaced it with some China made non official Surface charger, that's when I started getting all these ghost touches issue. I went back to exchange the charger for an official Microsoft Surface charger but it is the same problem still exist.

Is it a touchscreen issue or a grounding issue with the Surface or the charger issue? What do I need to try replacing?