Zac's E on Dragon and Baron wall. [GAMEPLAY]

In several games now I've experienced a bug while playing Zac. Occurring when I'm trying to jump either over the wall around Dragon or Baron. I charge up my E and instead of jumping over I just jump strait up and down (made sure I position my cursor at the far end, its a game bug). This dos not happens every time, and only seems to occur if I am standing next to the wall (not if I'm jumping some distance from it). Have happen on several different places around the dragon pit.

So far this have only occurred when trying to jump into the pit, not out from it.

Zac's E have had the habit of sometimes having a weird animation when jumping out of the bushes, but that was not game breaking, this however kinda is.