Sockets Duplicate When Mesh is Reimported

When a static mesh that already has sockets created in it's original third party program is reimported into the editor, it's sockets are duplicated. Going from 10 to 20 on reimport. 

1. Download the attached FBX file(which already has sockets created) 
2. Create an empty project
3. Import the FBX file as a static mesh with default import settings
4. Open mesh editor and see there are 10 sockets
5. Go back to the Content Browser and right click static mesh <  Static Mesh Actions < reimport 
6. See mesh editor again
7. See there are now 20 sockets 

Results: Sockets on mesh duplicate when static mesh is reimported 

Expected: Sockets do not duplicate when the static mesh is reimported