Welcome, Dante. Your bike has vacuum operated petcocks. They're supposed to shut off automatically when the engine isn't running, but they have a nasty way of not doing what they're supposed to do. Your BS34 carburetors vent the float chamber through two large holes in the intake bell at 3:00 and 9:00. What you're seeing is what happens when a petcock and a float valve fail to stop the flow of fuel. The spilled fuel that you can see isn't the only problem. The stuff you can't see runs into the head, past any open valve, past the rings, and into the crankcase.
There's plenty here on petcock repair, float testing, fuel level inspection and adjustment, and float valve replacement. The Tech button and the search window are your friends.