fuel tank vent Leaking / misting

[randy]

Is it normal for some fuel to mist out of a fuel vent? Im running the Finch performance dual vent system that is mounted in my trunk and after going on for some spirited driving and parking the car you can hear and see fuel mist coming out of the vent. Any idea what it could be? 67 camaro ls3, Ricks notched corner tank with new camaro fuel pump.

FYI we have this system on 2 other cars and experiencing the same thing.