Killed Hydra no credit

Time:02:30 pm EST
Frequency: !st Time
World name: Diabolos
Character name: Lilith Hunter
NPC name:n/a
Monster name: Hydra
Class/Level:Paladin Level 50
Party or solo:Group
In-game time: Have no clue
Area and coordinates: Halatali

We killed the boss saw duty completed across the screen had a wyvern still up so we killed it then nothing... we didn't get zoned out, the journal didn't update. I took screenshots submitted a bug report. We waited for the instance to time out and it said duty failed. Haven't beaten it since is there an in game GM that can check and credit those of us who needed the kill credit?