Sort of difficult to explain precisely, but here’s a couple photos.
This occurs on Highrise, while in the basement. When fog is enabled, the water in the distance clashes with the rest of the environment.
Night (With fog)
Day (With fog)
Below are the same photos taken just outside of the building with properly rendered details and fog in the distance. It may have something to do with looking through the glass panes.
Night (with fog, outside)
Day (with fog, outside)