my activity B has two successors. G with SS relation, and D with FS relation

all of them are critical

so B and G are critical because of their SS relation

but finish date of B is not pushing D, there is a 1 day gap. D is pushed by something else

I checked all float dates for B and everything shows 0. I understand that Total Float is 0, but all other floats also relate to start date of B then? so although B end date has 1 day of float it doesnt mean anything?