Korrak doesnt tag correctly *with screenshot*

[Thirio 0]

So I was in this AV with character Thirondil and after 2 hours both sides went in the middle to get Korrak.It seems like we went the first and one of our tanks took him away from the horde while we fought both at the same time, we downed him, did most damage, and it showed all the time with a colored bar like he was tagged and NOT grey. Didnt get credit.