Issue with AI and navmesh in 2D

Hi

I’m a new UE4 developer and I’m currently working on a 2D game,

I have an issue with our AI in the game.
I’m using navmesh for area’s they can walk around.
The AI is working fine only in some NavMesh area’s and some area’s they don’t work
the weird thing is I can move the same AI to the area that the navmesh works the AI will behave just fine.
The main issue is that in-game when they move to a random location, they go to the same spot all the time.
I have tried removing those navmeshes and add new ones but again they behave the same in those areas.
How come that in some area’s with navmesh its working fine and in some it doesn’t work?
I have been trying to solve this for a few days now with no success.