Mesh breaks up at edges on import

I am using blender for modelling. I used hard edges and weighted normals to calculate some bevels. In blender, the meshes look normal. In UE, they split and the mesh becomes see through. I did try clearing the hard edges too. What am I doing wrong?

Blender:

UE4:

Well fortunately I found the answer. It was utilizing my master material that had grey in the Height node (I was just testing) so it kind of…exploded. Turned it to black, it works.