The load order tells you which mods are loaded first, from top to bottom. This is important when you have mods of the same type, for example texture mods as the last mod will overwrite the previous one and can cause problems. But by looking at your mod list i dont see a .esp of the mod that made your OA armors black so i guess it was just a simple texture replacement? Try to remove this texture and see if you still got that problem. i think this black armor mod conflicts somehow with one of your mods.