Weird shadow shows up only in game

I've been working on this mod that's just a edit of an existing hairstyle. I'm done but when I use it in game there's a shadow of where the haircut used to be, and I'm not sure how to remove it. 

drive.google.com/drive/folders/1PaU0DKYm62eS0pL5aVdSXuaoIZBL8-_6?usp=sharing

Here I put the package, mesh, and texture.