Sounds like there is a stray connection that isn’t grounded properly. AC power is a little more complicated and arguably dangerous to diagnose if you don’t fully understand what you are looking for.
One thing to confirm, are you using a make-shift extension cord or 3 to 2 prong power adapter? Because the ground prong’s purpose (3rd prong on 3 prong cords) is to give the current somewhere to go beside into you when thing aren’t perfectly insulated.