Hey guys, the texture error was not in MOHAA, GIMP or the operative sistem, it was in the image itself that had something wrong.
But now I have another problem, MOHAA seems to ignore certain textures or layers, as ou can see in the scope skin bellow, it has a green/blue effect added to the lens, but ingame only the black areas appear.
zoomoverlay.jpg
***Edited:- Nevermind, I fixed it.