Bug - Caityn Autoattack Damage/Animation timing inconsistency

Caitlyn's auto attack is bugged. Sometimes it deals damage too early (ie: damage is dealt before the attack animation completes) or sometimes perfectly. It totally ruins my CS rhythm and trying to weave in harass. Steps to reproduce:

1. Try to CS
2. Eventually, one or two attacks on the wave of minions will have awkward damage/animation timings.