Gas dripping into secondaries when car is off... Why?

Just something I noticed today... I turned off the car and took off my air cleaner, and I heard this gurgling noise. Then I looked into the carb, and gas was dripping into the secondaries, and then I noticed it was leaking through the gasket between the intake and carb! The bottom butterfly is closed, and I could actually see gas standing inside. I don't even thing I had the secondaries open yet.

I mean it stops eventually once the fuel pressure is gone.

Whats up with that? What does that mean?

Oh, I have a 770 Holley Street Avenger

Thanks!