ok i've had 2 seperate issues with this. the First time happend while the christmas event was going on. the 2nd time happened today. This is what happened:
I went and accepted my stone lotus assignment, which was to kill 10 stone lotus renegades and get they're medalians, then bring them back. So i killed the renegades, got the medalians and took them back. i clicked to turn them in, it told me the quest was completed, yet i didn't recieve any stone lotus rep, nor did it remove the medalians.
The other time i was doing the christmas event to kill 10 yetis and collect they're horns and turn them into the christmas spirit. Well i killed 10 and got 10 horns, went to turn them in, said i completed quest, but didn't give me a snow flake and didn't remove the horns. I didn't think anythign about it, infact i figured that it may be stopping because it was after christmas. But today i figured it had to be a bug. I would appreciate any help you can give me.