Purchased 2 levels from UE4 market place but both map preview has some error(light map?)
I have rebuilt the lighting but it doesn’t seems the issue. Not sure why the green lit lighting show up for no reason
The Green you’re seeing on the wall is the default Decal actor’s material.
You can select that make sure that the proper decal material is assigned.
Deleted all the decals blueprint and it work fine.
I think it has something to do with engine version. Cheers