Terrain Going Up after Build Game

Hi Guys,

Im making a simple proyect of a roller coaster.. Everything was fine some days ago a made a build to see if everything was going good, and yestarday I make other build to see if everything was working but I find that my terrain goes Up after the buil.

I mean all my objects are under the terrain after the build.

I have attached pictures. Any help would be apreciate.

I tried making everything child of the terrain but didnt work.

Thanks!!!!

[1]: /storage/temp/68665-beforebuild.png

[2]: /storage/temp/68666-afterbuild.png