Sated Devourer Bug with Aatrox

bugs the new in game. Sometimes it stacks as intended making every other auto proc your W extra dmg or heal. Other times its over stacking and makes you auto 4 times in a row without benefit of your W proc. Orrrr maybe I don't understand this item, but I noticed it was spurratic and random and would not work when I needed it to haha xD.