[Gameplay] Azir Ultimate Bug

I was playing azir the other day, and got in bad positions, so i tried to ult my enemies away, but the wall stopped right before me and they didn't get knocked back, and when they walked into it, nothing happened. I have no idea why this happens, but it got me killed twice. I have the two clips of this bug occurring.

Clip #1: https://youtu.be/258dKqJhE5s In this clip Yasuo starts killing me and I try to ult him, so I might live to see another day, but my ult stops just before him, not knocking him anywhere. Then ziggs satchels me away from my wall, and after that I die

Clip #2: https://youtu.be/syBJaViPdlU Here I'm poking the baron, so it may attack the enemy, but i get collaped on by 4 people, so i ult, this time the does not stop, but it didn't knock anyone away. Sona just walks out of it like nothing happened, then her, Yasuo and Jhin all walk into it, like its not there.

I'm sorry for the bad resolution in the videos and for the language mistakes, I might have made some.