Static Mesh not Working

I made a bullet shell in blender, and imported it into UE4 as an FBX file, but half of the mesh is invisible, and the mesh kind off follows the camera around. What is happening here? I did the exact same thing as the guy in the tutorial How to Export Models From Blender to Unreal Engine + Troubleshooting (Blender 2.8) - YouTube, but it’s not working. Thanks