Shore Power Problem

I have a live aboard 43' Vista Motor Yacht, which has a single 50 ampere 220 volt service.
I had no problem with my Shore Power for years, while I was in the water.
Pulled the boat last week for routine maintenance.
I was able to hook up to a full electrical service, in dry dock.
This was I can keep my chest freezer, refrigerator, battery charger & work power going.
When I first hooked it up, one phase was reading 120 volt the other was reading 150 volt.
I check the voltage at the source(panel), both phases read 120 volts.
I turned the fluorescent lights on in my stateroom, they got real bright & the ballast smoked.
I immediately killed all the power to the yacht.
Has anyone had a similar situation?
Looking for advice.
Capt. Bert