Part of the mesh invisible from differant angles,Part of the mesh invisible from different angles

Okay so I exported my mesh from blender, which looks perfectly fine, and when I import it to unreal it make part of the face, and ears invisible from certain angles. One angle I can see the whole ear, but part of the face is invisible, the body and legs are fine it’s just the head and ears. Did I export it wrong? ,

I just decided to delete it supposing that it was something wrong with my creation