It’s hard to see but in the very center of the axe (the red part) the face is missing and you’re seeing right through to the other side. And I’m not sure what you mean by fixing the normal and making it two sided. I know which file is the normal, but i don’t know how to make it two ssided. The only thing I’ve tried was in blender and it fixed the whole axe except for the one face that I mentioned above