I recently bought a cheap USB-C power delivery charger and 2m USB-C cable for my Surface Go. When I connect it, everything seems to work fine, it charges at full speed, etc, but there's one weird thing: The touchpad starts acting weirdly, as if it received random signals. Touchscreen seems to work fine though.
My question is, what could have caused this? I'm not looking for a solution, because that would obviously be to buy better charger, rather for explanation what exactly might be happening.