Terrain collider displaced?

A rather strange thing happens to my terrain. For some reason, after rearranging some assets and restarting my computer and Unity, all objects sink about 5 centimeters into the terrain. Everything works fine, but objects just sink in a bit, like the terrain collider is displaced form the renderer.

Any ideas as to what might cause this?

Also my terrain often costs about 400 draw calls, which seems very high.

Figured it out myself. Min Penetration in PhysicsManager was set to .05. And turning pixel error, etc on my terrain lowered the draw calls.