60-volt potential runs to ground

This unit works fine but I noticed it has a 60-volt potential going to ground when the unit is not running. If I plug it into an ungrounded receptacle (without running it, of course) I get this 60-volt AC reading between the MW door the kitchen sink. There is no continuity between the ground lug and neutral or hot so I don’t think there is a short. Is this normal? If not, what would be the cause of it? Thanks.