Mordekaiser Q bugged when autoing fiora and she parries

So, I encountered this bug on Mord during a promo game, where whenever I used my Q empowered auto on Fiora and she parried it with W I wasn't able to auto her for a good 2 seconds. Not only did this absolutely piss me off, but it also caused me to lose lane and fail my promos. I just wanted to address this bug incase anyone else has encountered something similar. And I know that it wasn't me just missclicking because i would keep walking with her, right next to her, but i wouldn't be autoing.