Quinn auto attack bug

Since her creation quinn has suffered from canceled auto attacks. shot launched, landed, hit animation, 0 damage done. this isn't a case of a enemy champ that healed but 1 last hit on a minion that is marked and takes no damage again shot in flight, turn away from target, shot landed hit animation 0 damage. its an auto attack it is in the air. caytlin does this all the time with no cancellation but mid range quinn cant turn away even after shot is launched.