Can't Understand Arma

Just remove them manually, not all games are detected correctly

there are 2 separate item IDs for Arma games (at least it's the case for Arma 2) and bundle key item ID is different from Steam Store item ID returned by API.

All you can do is to hidethese GAs (click crossed eye icon next to GA name) and you win't see them again.

I believe there are two versions of Arma II, one that is RoW and another that is NA only. Since this site uses the US store front, I'm guessing that is the Arma that we keep on seeing.