Rek'sai input bug

I just played a few matches as the newest champ on the summoner's rift beta, and I noticed a strange bug happening whenever another Rek'sai was in the game. I kept experiencing input issues whenever - at least it seemed to me - an enemy Rek'sai jumped into a tunnel. The game would acknowledge I was pressing a button; I would see the green arrows when I right clicked, or the "on cooldown" soundbite would play if I pressed an ability, but Rek'sai would not accept the input. I would keep moving or stand still if that's what I was doing. That would last for maybe 2 seconds at a time. I asked one enemy Rek'sai if they were experiencing the bug, but they didn't seem to notice it. I was using the Eternum Rek'sai skin, if that makes any difference.

I'm fairly certain this isn't a problem with my mouse and keyboard, if there's anything else you need from me just let me know!