Solved: AO map always appears flipped when adding AO map to DDO project

I've noticed often times when I add a new map (Ambient Occlusion) to my DDO project, the map appears inverted in Photoshop, and likewise on my model in 3DO. I solve the issue each time by manually inverting the Texture Base layer in the AO .PSD's layers and it then appears correct, but just wondering, is this intentional? known glitch? Would be nice to not have to do this in the future.
Thanks for the info and help.