Hey everyone. I have a Fender Mustang I V2 and whenever I turn it one and connect it to a guitar (no pedal in the setup, just guitar and the amp) there is a small electric shock whenever my arm hit the metal parts like bridge. I have a voltmeter and there was about 1.5 to 2 volts on the guitar body and even the cable itself! Is this normal? Or there is something wrong with the amp? Does the guitar cable even supposed to have a voltage in it?