Azir Ult Bug?

I was playing clash and my Azir ult (Emperor's Divide) went the wrong way. I thought that MAYBE it was input error but then it happened again later that same game, so I went into the practice tool to see if I could recreate it, or if I was just too slow on my mouse movement between flash and ult. I slowed it down so that you can see EXACTLY where my mouse is BEFORE I press my ult key. It doesn't happen every time but at all is more than it should.