Here is what I think is happening. If you are using a replicated terrain(autogrid) because I didn't use anything else. If I moved the objects above the grid so the light looks right the objects look like they are floating at certain angles.I changed grid numbers to smaller numbers, but it didn't help, but maybe there is a setting to alter the grid so it won't do this. It could be an unforseen problem tho.

No need to think outside the box....
    Just make it invisible.