Hey @digital-emotions , that is odd! I’d check these things first:
Are there multiple UV maps listed in the object data tab? If so, delete the ones you don’t need any longer. What gets rendered in Blender isn’t always what gets exported if there are multiple, which can cause some confusion.
Second, are the normals of those parts flipped on the mesh itself? That would cause the normals to be backwards since the whole thing will be interpreted in the negative.
