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niki s 7niki s 7 

Security model

I have 5 users and they are associated with different different profiles. And everything set in that way so that no one can see each other records. Also owd is set as private . But one of them available to view the records why so 
AbhinavAbhinav (Salesforce Developers) 
Hi Niki,

He might have "View All" or "Modify All" permission.
Details:
https://www.forcetalks.com/salesforce-topic/what-does-view-all-and-modify-all-permission-do-at-object-level-in-salesforce/

Role Hierarchy also might be the case.

Hope It helps, Please mark it best answer so that it can help others in future.

Thanks!
niki s 7niki s 7
No user don't have view all and modify all permission