Champion Bugs

Any and all Bugs me (and others) have found on various champions

with that out of the way, Sion has a rare bug, only seen it twice I think in my time maining him, his ult is supposed to stop when he hits an enemy champion, but twice he hasn't stopped and just ping ponged between a bunch of clustered champions, the thing is, they would have died to the King of CC but I couldn't do anything! I had to wait for the ult to time out as I kept mashing the R button to cancel early but it wouldn't