Fiora Riposte Bug?

I'm not sure if it's just me or this happens with alot of people. Now I'm not a Fiora main and I haven't really played her much since her update or even before that. Though I've been up against plenty of Fiora's both in normal and ranked play since her update. I have no idea if this is intentional or not but it doesn't seem to be mentioned anywhere in her Riposte description that there is an attack speed slow. I've had this happen on a large variety of champions and it only seems to affect melee champs. After Fiora uses her Riposte I'd hit her with an auto attack to pop it rather than wasting a spell. After which, I can't hit her. Even attack moving doesn't seem to be able to target her. My attack animation will be incredibly slow and sometimes won't even happen at all and my champ seems to drop her as a target completely and be unable to pick it back up as if she were untargetable. It doesn't matter if the skillshot that comes after her block hits me or not, and if she blocks a spell it isn't a problem. But when blocking an auto attack it just seems impossible to attack her. An issue that caused alot of lost lanes because she was winning trades for free since I couldn't attack at all. I know she stuns if she soaks cc with her parry. But it doesn't say she cancels all incoming auto's for a period. As an example. I played a game as olaf against fiora, in lane she parried my auto while we were both quite low health. I had my W active and was at 1.7 attack speed. But I wasn't hitting her at all. and even if I targeted her Olaf just wouldn't swing (Even while ulting I couldn't seem to attack). Another example is when I was playing skarner. I baited her parry and then hit her with my E so I could stun her on the next hit. I didn't lose vision or change targets. But she was able to activate ult Q and auto twice before my attack animation played out to stun her even though the command was given almost 2 seconds beforehand. It isn't lag (I play at 60-70 ms stable) and I have friends who have also been affected by this issue playing against or as her. Where their lane opponent would just stop hitting them after the Riposte. I've no idea if it's intentional, and it could just be me specifically. But considering I've seen it happen in games outside of my own and it gives the Fiora a massive edge considering she gets in plenty of free hits just because you can't actually attack her for some unknown reason. I've seen yi's with 2.5 attack speed just stop swinging because she parried an auto. Considering Yi's Ult makes him immune to slows. It makes me think this is more a bug than an unofficial attack speed slow. I've no idea what causes it or why, but it seems very consistant and punishes anyone who it affects. I've lost lanes and games simply because of this bug as fiora parries one hit and whoever's auto hit her can't atttack her anymore. It doesn't stop you hitting anyone else, just Fiora for about 1-2 seconds, which is more than enough time for her to get plenty of damage in while your champion just looks at her. With AA reliant duelists like olaf or aatrox etc. that could easily outsustain Fiora this screws your laning phase completely as you can't actually touch her. Like I said though I don't know if it's intentional or not, but it's definetley there, considering we've tested it and a champ can go from attacking 2 times a second to once in the space of almost 3 seconds. If I'm wrong I'm okay with that, but it's something I've noticed over the course of alot of games and has had a heavy impact on said games. If anyone could provide clarification to prove me wrong or evidence to prove me right that'd be appreciated since if this is an actual bug it means I've lost a tonne of lanes against her because of an unintentional bug that is being unintentionally exploited.