yorik minions and mundo cleaver interaction

I played a match last night as Mundo verse a yorik. There were many a time through out the match where i would use my q and it would pass right through yorik's minion ghost. At first i thought i just missed but when it continued I figured it might be a bug. There 2 accounts in that match where I threw a cleaver through all 3 of his ghost minions and watch it hit a regular minion behind it. Not sure if this is a hitbox bug or what, but would like to see this fixed. The width of Mundo's cleaver is about the size of yorik's ghost minions, and so I don't see how it would sail right through them.