The area that was assumed to be a normals in the diffuse map is more than likely the tangent map for the hair shader in the game engine, probably unreal engine. You already have the hair normals in the normals map, so there is basically nothing else it could be. The yellow part of the hair is probably a trans map, and the red, green, and blue part, is the tangent map. The color of the hair would be defined as a base color chip.

All of the maps are probably DirectX based maps and the green channels will need flipped for OpenGl in Poser, for the normals and tangent maps to work properly.

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