Eh... I think first you should go through this thread
! because I am pretty sure you shouldnt
have 2 games in the bohemia interactive folder! at least ive not got that anyway.
When I installed my games, it was ArmA 2 first, then Operation Arrowhead, BAF, PMC, and they
all installed in the same folder! that folder is called "ArmA 2" and inside that folder ive
got all my addon folders as shown in the pic:
I think you should combine your game together properly first from the link above.
Just a question, when you play your game, its ArmA 2 and OA together? or you just play by
clicking either of the .exe files? I think the reason why your mods work in ArmA 2 is because
you have not combined the games.