[GAMEPLAY] Lee sin q basic attack while stun

I had a game as twisted fate and every time I tried to stun a lee sin, while he was flying in the air because of his q, he could still do a basic attack afterwards. (This was definitely not his q damage, he did a basic attack afterwards) I noticed this at least five times during one game. I don't know if this is a problem with any stun or with just the twisted fate gold card. When I said trying to stun a lee while he is in the air, I mean that the card hit him mid air.