Mechagon lockouts not working (3/8)

Hey there, mechagon lockouts are not working - we killed 3 bosses and our tank left midrun without saying anything.

We formed a new group, we tried joining a new group, we tried relogging, we tried resetting instance - we keep getting put into a “hard mode” instance there are two bosses alive and MK8 circling the troll boss.

People can’t seem to join in 5s as 1 or 2 people are left out of the instance ID.

Anyone else know a fix for this or ?

Notes:
I have tried joining new groups that are completely clear of anyone from my original instance and all 5 of us are starting at a hardmode checkpoint, we have no idea why.