[GAMEPLAY] Yorick R stuck on tower

I was playing a game as Yorick, and I had used his ult around our mid tower during a teamfight. At some point after her summon, she was stuck in place and couldn't move. She didnt move when minions were nearby, nor when I was near her. The only time she was able to move was when the enemy team eventually took the mid tower, which was around 10 minutes from the time I initially used the ult