Twisted Treeline, Jungle Creeps not attacking?

So I know this is a pretty basic and small bug, but it was something I just found while playing 3s. When I went into the jungle and played with Master Yi , I would Alpha Strike one of the creeps (didn't matter which one, it happened to all of them) As I would Alpha Strike in, the creeps would stay exactly still, attack animation was gone and I didn't take any damage. But this doesn't happen every game just here and there, maybe a bug or something to look into? Again its something small and barely noticeable but thats what I found.