(GAMEPLAY) 8.6 Alistar + Kai'Sa bug?

Well, i still have to get some video cuts to upload them here, but i just had to endure one of the most annoying bugs ive ever seen.

Playing as Kai'Sa, against Alistar supp, everytime he was close to me, my champion wouldnt stop moving towards him like if she was charmed by Ahri, it was not a stun, nor a slow, no abnormal status text, nothing, just that everytime he was on his basic AA range of me, my char would just wanna catch that cow, not even trying to attack, and no matter how many times i clicked away. That effect only stopped when he went away. On chases, it was the same, i only could escape from him when allies made him be slower and i could finally (by spamming clicks and see Kai'Sa spinning like crazy) be out of the AA range.

I couldn't say much more about it, cause it only happened to me in one game (yet) but it was EVERYTIME he was close to me, and that happened a lot, so im pretty much sure its a bug, ill be posting later some cuts of the game where it happened.