You might be using custom trust list, in my case, with default trust, Bitcoin_Arena seems to be supporting the flag, he is a DT member according to Default Trust.
Oh, I was looking at the wrong account (the one that created this thread which has 1 inactive flag) and not the MultiCoinGames. I can see it.
How much DT support needs for a flag?
More supports than opposites. If it has 1 support and 0 opposites (from DT) then it is active.