This isn't just you; it seems both the Cloud of Darkness (Chaotic) raid and the new Jeuno: First Walk Alliance raids put A LOT of pressure on the netcode of the game just due to all the animations going off and inputs from different players. I've seen quite a few people complaining about animation lagging during these since there's just so much going on. Oddly this doesn't happen in any of the older AR's just the newest ones for me so I'm assuming there's something wrong with how they've implemented these new raids