Problem with importing a mash with a skeleton from blender(auto shade smoothing)

When I import a mash from Blender that has a rig for some reason the mash gets shade smoothed

The mash with out Rig:

The same mash but this time with a Rig:

Can someone tell me what to do to fix this because I have no idea why this is happening.

Thank you in advance :slight_smile: