^^^^ What countryboy said.
I left gas in the tank of my Craftsman tractor over the Winter. When I drained the oil this Spring, I got 2.5 quarts of gas & oil out of an engine that only takes 1.5 quarts of oil. I rebuilt the carb, but also added a manual fuel shut off valve so that can't happen again.
I was going to suggest a fuel shut off too. On my snapper I have to shut it off every time because the pin that holds the float is broken where it will leak but it isnt a problem with the engine running because of the vibration.
To me it sounds like it happened when ranger was using it.
Ranger can you tell us if the oil level was right when you started?