Zac E goes short

I recently played a Zac ranked game and this is a champion I have played fairly often and I came across a bug that occurred 2-3 times in that game. When I would use my E for some reason after I charged it up and used the ability, the animation would occur and finish as it should but you would land only a little bit further than where you originally were. Basically, it would cut you short and the animation would show you going up in the air then fall back down traveling only a little (It looked a bit weird considering the animation took you to the max height you would go when you used the ability and it worked properly). Also to clarify the location where I would land was nowhere close to where I wanted it to.