Nav mesh appearing above the mesh

Hi guys, I have a Nav mesh on my floor, it is there but its not on the floor level (see attached) , I have set a simple box collision on the floor, it properly wraps around the floor. but the nav mesh is appearing above it . any idea how Ican fix it ?

This is normal, also there is a setting for the visible offset.

If it wasn’t offset it wouldn’t be properly visible through the floor geometry…