Unreal 5 strange lighting look

[Francisco Penaloza]

This is random, sometimes when I export from REVIT using Data smith in to Unreal 5 everything looks OK. Other times is looks like the image below.

I don't know why.

Any ideas?

 

[Nazzareno Giannelli]

This is because you probably tried to build baked lighting and the meshes are not properly setup for that. This is a common behaviour that comes up when UV maps and lightmap resolution are not setup correctly. Since Unreal Engine 5 comes with Lumen lighting system you probably do not need or even want to bake lights anymore. If this light bake was unintended you should be able to completely avoid this issue disabling Static Lighting under Project Settings.
Let me know if you need more guidance or help.