Bow mesh going somewhat invsible in s4s

was making my first cc clothing, the meshes of the bows looked fine in blender, but when i tried importing into s4s half of the left bow was missing/went invisible. i checked the texture and uv map which all looked correct, so any suggestions on how to fix it?


www.mediafire.com/folder/kgfls6lfl4ody/mesh_issue