Please help! Navmesh problem

Hey guys. I recently had to rescale my game because of a glitch and now I ran into a problem. So I have a wall and floor, wall is not walkable and floor is walkable, the floor turns blue when baking as it should turn. But there is a huge unwalkable area(not blue area) between the wall and the floor. Any way I can make the unwalkable area between wall and floor smaller? Thanks!

Hi, you can change the Radius variable in the Navigation Window.