Lvl.28 storry quest bugged

[Gr1mReaper]

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.

[Gr1mReaper]

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