Why my Occlusion culling result is coming this wierd ?

Unity Engine
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See why this result is coming - My Screencast

I have tried many settings but dont know whats the issue.

I have noticed that Occlusion culling works fine when the scene is started but as i move, things go wrong, see here-

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Bump

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I’ve seen something similar before on a model that had its faces separated in the 3D app. The solution was to use a 2-sided shader inside Unity. However I can’t say for certain that’s what’s happening with your scene.