at top of the carbs, there are two different kind of holes:
there's a port on each carb cap. maybe 2 or 3mm in diameter, one on each carb - 4 in total. these should be covered by rubber caps with circlips.
then there's one port at the center of carb rack, directly above fuel inlet port. there's a hose connected on a T-piece which is placed there. I cannot imagine how fuel could leak out of this. This is float bowl vent line and nothing else than fuel fumes should be coming out of there. Fuel coming out of there would mean that you have you float bowl full of fuel
if you try to point at some different hole it would be probably the best to make a photo and draw an arrow pointing at the hole.
But speaking generally, there should be no fuel above throttle flap except of choke fuel line.