[GAMEPLAY] Kayle's autoattacks with E on stack 2 times with Spellthiefs

HI :) I played Kayle support recently and i noticed, that when i hit an enemy with an autoattack (with my E on) I got from my 16 gold instead of 8. I'm not absolutely sure about that but i also think they get hit by Thunderlord's Decree when i hit them with just a Q and an aa. i think the damage is just somehow split between the physical damage from the aa and the magic damage from the E, because if i hit a minion next to them i only get the ordinary 8 gold. Don't know if that is supposed to be like that, but it seems like it shouldn't be :) Kayle is OP enough :D

PS I don't usually read this forum, so I probably won't answer if you ask me questions about it. Sorry :(