Hunt bug

I had Gnath Firedrone as one of my 3star hunts and went to the gnath area to kill it and noticed that not all Gnath Firedrones in the area are tagged for the hunt even though they are the same name only different level. This is not true for any other hunt mob I've had. If the mob has the same name even at a different level it was always tagged. These were not in different areas at all. Same general area and I tried killing the non tagged one and it did not progress the hunt. Either someone messed up with the hunt code or someone messed up in localization.