Terrain detailed objects rotated + mesh wont save?

First problem - So I have objects for the Terrain's detailed mesh,and when I use the prefab without it,its not rotated,but when I paint it on the terrain its ALWAYS rotated even when I change the rotation in the prefab. How would I fix this so it lays flat like it should?

2nd problem - I use blender for all meshes,and and sometimes when I save an object,it loads,but when I delete it and reload it,its like I never saved it. And when I use textures,it kinda changes ALL textures,like if I use a transparent texture on a 'fade' effect for a tunnel,it changes the 3D Geometry to,and when I change the 3D tunnel part,it changes the part that should be transparent. How would I go and fix this? I've looked it up for both of the problems and can't find anything.