Ah from character movement.
Im not sure how your bp is setup so its hard to see what might be the problem.
There is propably a check from the “Jump” that checks if IsFalling is true?
I generally create my own booleans for things like that so im not sure how IsFalling checks to see whether it is in the air or not.
Maybe add something like this and check what the print string says when you are in the air.
It should show true when in the air and false when on the ground every second.