Zzrot Bug [GAMEPLAY]

I was playing a ranked game and I placed my Zzrot Portal next to my mid inhib tower. The Voidlings that spawned got stuck on the tower and couldn't move out of that position.

I was on Purple/Red side and I placed my Zzrot Portal left of the inhib tower.

This was my first time getting this type of bug Proof of the bug http://www.replay.gg/search/na/Season2Rengar#2392646265 Around 21:15 you can see the bug