Hunt Mark Not working for Three-Star Clan Mark

Hello there. Have been doing my daily hunts everyday and today had a strange problem. The mark (Gnath Steeldrone) I noticed did not have the hunt marker on his head and also didnt count when I killed him. Included is a screenshot of the area to confirm I was in the correct place it seems to just be a bug (not pun!)

Thanks.

http://i.imgur.com/YWbTWpY.jpg?1

I ran into this today as well. If you move further south into the depression, there are level 57 mobs also named Gnath Steeldrone, with the hunt icon over their heads. I killed one and got credit.