Landscape Alters Upon Save

I have a basic landscape on my 4.7 level, and when I save, it deforms, visually. If I play the level, the collisions are for the proper landscape, but the visuals are for the altered (causing clipping of the character into the landscape). Sculpting the landscape reverts it to the way it should be.

Here are screenshots to show what is happening.

Thanks for any help!

-so you use two landscapes or just one?
-make sure that you set the quality settings to epic

There is only one landscape.

Changing detail settings did fix it. Probably a bug with LOD, or something. The detail was set to low (yay, school computers), and anything medium or above fixes it. Thanks, fighter!