After some rearranging my bedroom, I had to replace my US plug power adapter to a 3rd party UK plug power adapter, whenever I plug my iPad Air 2 into the 3rd party charger, the screen starts to glitch and it acts almost like there is another (invisible) finger constantly on the screen, this causes issues when selecting different keyboards, playing games, typing and scrolling through internet. But when I remove the iPad from charging, this issue doesn't happen... it's almost like the touch screen having a weird spasm whenever it's got water droplets on it.
When I had my old original Apple US plug adapter, this problem never happened, also I replaced the original short and fragile Apple charging cord to another one that is 3 metres (although I don't think that the cable is the issue because I've been using it for a very long time).
This issue is quite new to me and i am quite unsure whether it's the iPad itself or the power adapter...
What should I do?