Another thing to look for - your grayscale textures may be getting gamma corrected, and will alter the values being used to set the roughness or metallic property. Uncheck sRGB on those textures, or set to TC_Mask compression.
Another thing to look for - your grayscale textures may be getting gamma corrected, and will alter the values being used to set the roughness or metallic property. Uncheck sRGB on those textures, or set to TC_Mask compression.