Damage not being applied on a velocity-based procedure.

I made a procedure that deals damage based on velocity and if an entity is hitting a wall. For context, it is on tick while an effect is on an entity, which is applied by a hammer that deals high knockback. Its really inconsistent for some reason, even when using set health procedures to bypass i-frames. I tried hardcoding it to deal 16 damage, but that didn't work -- however, when I put something like 9999, it does work. I don't see any reason why it wouldn't be dealing 16 damage though. Note that both the "Set Health" and "Deal Damage to" procedures are both having this ussue.