A bug maybe with j4?

Alright. So I was playing a game as and this is what happened. I used my ult on but she charmed me. So nothing happened but there was still a cool down on my ult. It said my ult when off but there was no walls. I'm not sure if this was a bug or something but it happened to me. Idk if this has happened to anyone else or is a bugg but I thought it was really funny at the time lol.