suck or blow

The tube that goes to the throttle body to the valve cover is supposed to suck air into the engine. The crankcase pressure escapes out of the PCV valve. The problem with this is when you have a supercharger instead of the engine sucking air, the supercharger is now pushing air into the crankcase, and that air has to escape somewhere....too much air to just be sucked through the PCV valve so it blows out the next weakest spot, usually the PCV valve will come out first, lucky for you it was only the dipstick and not an important seal. A temporary fix would be to just cap the line that goes to the throttle body and put a breather filter on the valve cover. You dont want to just cap it because you need to get some air going into the engine.