Unity models import mess up lighting

I am trying to import some assets from Unity (Horror Mansion Pack) and all goes well until I build the lighting. After that I get the results in the screenshots.

Any idea why this happens and how to fix it?

Well, did you ever run these through a DCC program (Maya,max,blender)?
looks like the light map on the UV is messed up.

look in to this topic more.

No I’m not too familiar with those programs. The author told me before hand I can use them for UE4 pretty easily without needing to modify them.

I can’t seem to figure out how to reset the lightmap as the link says.

For some reason when I import them as skeletal meshes the issue goes away.

Well that’s not good, that means your static meshes will have data loaded for a skeleton and eat your frames if you let it.
I fell like some problems could be solved if I where just there.

Yeah I definitely can’t use them as skeletals. I was hoping that could be a clue to figure out the issue but I’m still no closer it seems.

Perhaps I could share one of the meshes with you and you could take a look?

Sorry I’m just a one guy, wish i could help better, I’m still learning my self.

I could take a look in a few hours if it’s good for you…

Hi!

Sadly the mesh is not “Unreal ready”! :S
Although it has 2 uv channels but non of them is good for lightmap! Both of them have overlapping faces… even Unreal can’t generate a usable lightmap from those!
If you’re familiar with a 3d software you can make your own lightmap uvs for those meshes…
Like this they will only work with dynamic lighting…

I’d appreciate any help you could offer on this. Below is a link to one of the arches.