I found out that sated devourers 
messes up Aatrox's w auto attack progression where sometimes it only requires one hit to activate the enhanced auto attack and the animation doesn't show the empowered auto attack. This was only in a bot game but I feel this could be in a normal game as well.
I thought this as well, in a real normal game I was playing. It is not a glitch, the item itself triggers on-hit effects twice. So first aa will apply one stack, second aa will apply two stacks healing, or dealing more damage. I did see, however a short time for no apparent reason right after getting the item the icon would not show or work for a short time, but this did not happen the next game.
