Unable to walk character using NavMesh

I created a 2 floor building obstacle with navmesh and use AIThirdPersonController prefab from standard asset.
when placing the target on the far end of the obstacle, the player is unable to walk.
see the video on the link below

https://vimeo.com/user98063114/review/333878978/a2a9142508

as you can see on the video the Path query nodes (yellow lines) are every where. Im not sure why it is behaving like this.

character are able to walk if i place the target nearby.
I have confirmed the obstacle are all walkable but i cannot find the problem why the character is behaving like on the video.

 

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