I've also had this issue on PCNA the last few times I've attempted HM. I think I'm following the circle only to realize I'm taking a ton of damage and in a totally different area of the room than the rest of the group. I've managed to clear non-HM by hugging the rest of the group and just trusting that they're standing in the right spots but it's just aggravating when you know the mechanics but the circles just won't display correctly.

Ps5 NA… horrifically broken here too.

It used to work fine for me, but lately with the circle not properly representing the safe zone, it's just luck if you stay out of the bat swarm. For me the circle stops moving, and I have to follow group members. It's been bugging out every time now.

I experienced the same issue yesterday evening in vet Castle Thorn (PC EU).

I only affected me in our group (magsorc DPS) and seemed to be completely unrelated to lag etc.

Sometimes, it would start out normally and the circle would move, but then quickly freeze. Other times the circle just remained in place.

In both scenarios, the circle would eventually correct itself until we pushed the boss and the swarm started again.

We did some investigation in the group (all 4 of us were on discord together) and it seemed to be related to the mechanics somehow - whenever I picked up a scamp-synergy, the circle would correct itself and move normally (it had to be me who picked up the scamp). We think that the add that spawns when the swarm starts, may be what triggers the "freeze" but we are not sure.

A different possibility is skill proc (crystal frag proc in my case).
If I had a proc at the ready when the circle spawned, it never started moving (until I picked up a scamp) other times it would freeze right after we engaged the add (it started out normally but than froze) - perhaps I triggered a crystal frag proc(?).
Another related observation is; because I was ranged DPS (the other DD was a stamplar), I was consistency the first to hit the add as it spawns??

Again, we aren't sure exactly what might cause the freeze and why it only affected me...

The most consistent thing was me picking up a scamp-synergy - this seemed to correct the circle every time, but again, a lot of stuff is happening during the swarm and we naturally couldn't test this in a consistent manner.

This has been broken as heck FOREVER!! It was broken for me on ps4. Now still broken on ps5. I’ve done TWO fresh installs, deleted all my saved game data, dropped all my quests, etc. Etc. Nothing helps, and it does it on multiple characters. Please for the love of all things, fix this dungeon!!

Posting because I've encountered this issue on PC NA @ZOS_GinaBruno . Apparently this has been a problem for at least 6 months now?

Same issue today PS5NA