Oh happy day, last night I got infected by a werewolf and started the quest.
I was hunting around for a huge beast and I slaughtered it!
Called in my pack to feed with them and low and behold, the corpse dissappears and they feed on what looks to be dirt.
Granted I was a bit lower level and it took me a while to kill it, I felt it was an accomplishment, however due to this bug I did not get credit for it, and now after countless of relogs, abandoning the quest and such, I end up with a monster I can't kill at all.
It's health pool is twice the size of the other one, the damage seems double as high too, and it regens faster than I can do damage to it.

I was feeling joy, now I only feel frustration, freaking bugs

Included a picture of the dirt eaters.

http://i.imgur.com/UTtCVlB.png