[GAMEPLAY] Bug where nautilus ult does not go off

Played a game and would ult and click on a champ multiple time and it never would go off. There were not stuns or impairs on the champion at all. I ever tried to just run and ult right of the bat and still nothing happened. It worked once in the very beginning of the game at lvl 6, but once i got R to lvl 2 it didn't work from there on.