Lvl.28 storry quest bugged

Level 28 Story quest Bugged
World name: Moogle
Character name: Grimm Reapper
Class/Level: Scholar 32
Party or solo: Party 4
Area and coordinates: Haukke Instance

Steps:
1. I startet the lv 28 Story quest, a skeleton in her Closet
2. I cleared the cellar,got all keys
3. Cleared ground floor,all keys
4. Breaking the seal and started killing miniboss bat
5. At 50% instead of running away he just becomes invulnerable,stops moving and stops attacking,after a while he resets to 100% hp and still remains invulnerable.
6. Leaving the duty after half hour of running around
7. Next day trying again but all mobs dead and bat inv.

Nvm,resolved.
Just had to remove join party in progress box