Reworked Aatrox Ult Bug

So let me explain what happened, I was in a ranked game and I was laning against a poppy as aatrox and i was in a close fight with her and I had ulted mid fight and for some reason after she had shoved me into the wall my ult just disappeared with around 8 seconds left on it and to clarify it was not because i had died, I won the fight actually and killed her but my ult just went away 2 seconds after being up and it confused me, also i do have video evidence of this bug and i will post it later on if you guys need a visual representation of the bug