Two separate runs of Hel Ra yesterday:

1. After the group splits, one upstairs and one downstairs, one group wiped and weren't able to res even after my group ended the battle; it just said "waiting for battle to end". As we couldn't get back to res them and couldn't progress at the point where the two groups merge again, my group suicided - and didn't get any res option. It still said "waiting for battle to end". The only thing we could do was disband the group.

2. After fighting the initial adds outside the citadel, the Air Atro boss did not spawn; instead the gate opened and 6 players entered, the gate shut behind them and the Atro spawned in there instead. The group on the outside then had to fight the adds until their door opened, and then the Atro (having wiped out the other group) came in there and of course wiped us out as well.
We later wiped and res'ed at the wayshrine, then it all appeared to work correctly except that the group to go upstairs could go through the closed door.