If its coming out there, some is probably running down into the engine as well, because the jet nozzle is right in the middle of the rounded venturi & it can drain both ways.
Kinda funny how it can over flow at the jet nozzle & not out the over flow hoses on the sides of the carb. Guess it must be a real slow leak past the inlet needle & finely has got the bowl full enough to come out that nozzle, but not the over flow hoses.
Neil