My iPhone 5s screen acts weird when charging
When my iPhone is plugged in charging the screen goes crazy. It's like someone is tapping random parts of the screen, I am using a Belkin lighting cable, which has a belkin logo at the usb end, I'm also fairly sure the wall plug isn't an apple wall plug. What would the problem be?
Also the output of the plug is 5v-1a, if that's important.
iPhone 5s, iOS 8.1