Terrain Glitching Through Road When Map is Reloaded.

(Image removed because apparently i can only post one image.)

as you can see in the first image, the road is smooth and terrain is fine. I can save the game.

but, every time i open the game again to work on it, it un-smoothes and creates these weird lines. it stays even when the player stands on it.

this is what its supposed to save as.