Rhino 6 - Odd lighting effects

Hi, I’ve been trying to make use of Unreal Studio for the past few months and whilst I am making progress I am finding some odd lighting effects on import of Rhino geometry. I’m not sure if this is due to conversion of the meshes and their UVs or not? I’m not sure what is transferred during the import process.

I have 3 light sources in the attached images, a skylight, a directional sun light and a point light. In the first two images, there are areas of shadow that are way darker than I would have expected and there are areas of dark that I would have thought would be dark?
Does anybody have any thoughts or tips for settings to check?

I the third image, the white table top has wide dark band around the edges, very weird! I have other objects that do the same on import. The wall in the background here has incorrect scaling of the texture map, I’m finding it difficult to control the scaling of texture maps going between Rhino and Unreal Engine

Many thanks!