Try to use «Terrain Settings / Material - Built In Legacy Diffuse».
Screenshot attached.

I've just got the Real world terrain (new beta version for Unity 5.x) for my VR project.
Everything worked well, except I got weird reflection on the ground. Over satellite image, I see a white layer of reflection. It gets severe especially in VR, as the camera is located very close to the surface. As you can see in the attached capture (upper - scene view; lower - camera view in VR), what I can see it a white layer.

I changed light settings, but it never disappeared. How can I deal with it?

Thank you.