I have had 2 carbs come with the diaphragm not placed correctly in the fork.

If it is dripping may be the metering needle is stuck, but dripping is not normal and should never happen. As nogyro said a fine spray is normal but that is not a drip.

If the metering needle is stuck open the carb will keep pumping gas through the carb and cause a dripping, (not drawing normally due to lower pressure in the venturi, but pushing it through) or at least thats what happened to me and that is how I understand these carbs to work.