Mesh material is different compared to play testing

Development Rendering
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1

269462-tonic-final-2.jpg
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The gun in Blender which looks just fine.

269463-weird-issue.jpg
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The gun in UE4 which looks terrible in the view port yet looks fine when I view the gun via asset viewer. Does anyone know how to solve this? I already saved and applied the materials and that does nothing. I think this is a bug.

2

Turns out the mesh’s materials are different only on this map. This most likely has to do with the lighting.

3

Wait actually it is not a lighting glitch. That map alone the materials are glitched. No idea how though