Self illuminating mesh problem

Hello everyone,
lately I have a problem with some meshes that seem to do some sort of self illuminating bug.
The meshes are exported using datasmith. I ve tried changing the material, tweaking the metallic parameter and for some reason I don t seem to be able to fix it unless I rebuild the mesh.

Any help from you guys would be greatly appreciated. Thank you !
See screenshots below.

its not the mesh it your lighting, its leaking through the mesh, try rebuilding lighting only and see what happens

Tried rebuilding lighting. same issue. The room is perfectly closed with outside boxes so there is no chance for the light to leak inside. Anyone else ? any ideas ?

Can confirm i also have a similar issue with meshes doing this. And it does seem like a mesh issue because by remaking the model it fixes the problem.

Remaking simpler models isn’t such an issue but more complex ones that I bring in with datasmith are more challenging to find solutions for.

If anyone can identify the inherent mesh issue it would be a major help!