Terrain component brighter lit

My terrain get a light issue.
The component that is over the map origo point becomes brighter than the other components.
When I move the terrain around different components get the issue, but always the one over the origo point.
I have a light source and a skylight, both set to movable.
If I remove the light source all components become black exept the one over the origo point.

Im having the exact same issue with a fresh project.