Zac changes direction when trying to charge up next to a wall

Best spot to reproduce is at the very top of Blue side jungle, just above Tribush. Go to the pocket just north of Tribush, go to the very northernmost tip of the pocket, and face directly north.

Verify you are facing North, then start charging E. Zac changes directions randomly, I have ended up facing about 90 degrees left, and also 180 degrees behind.