Hello Im relatively New to modding in bo3

I have had issue with my map for ages and when i finally fixed them I realised my zombies dont move at all.
I decided to view my nav mesh and couldn't see anything. I then noclipped out of the map and apparently all of my nav mesh in completly tilted.

I have tried using nav_volume and it hasnt done anything.

Any Fixes? This is the only thing holding me back from making my map.

image : https://imgur.com/gallery/7mXjQHe

edit : found the problem. I had put a block over my main floor and once i deleted it, it fixed