Azir ultimate bug?

Was playing a game as Azir when I faced a bug that was really annoying .

When I do the Shurima shuffle with ult , the ult seems to be going where Azir is facing not where my cursor is. I tried it many times during the game and I'm 100% sure it wasn't my fault.

However I tried it in a costume game and it was fine . ( Not sure why it happened ) T__T