Valerie's grounded super only deals damage on the last hit. The rest of the hits always deal no damage. Therefore, in some situations, if you land every hit of this super minus the last one, it will still deal 0 damage!
not a bug my friend
is there any other move in the game that can hit the opponent multiple times and still end up dealing 0 damage?
Geiger's Air super is the same, dealing only damage on the final hit, so if you hit someone out of it or they fall out due to akward positioning you don't get the damage.