I’m experiencing a problem with user permissions in a domain environment. I have two different PCs but with the same user ID joining the same domain. My setup is as follows:

File Server Configuration:
Users are only supposed to view their own department files.
NTFS and shared folder permissions are configured to enforce this.
Issue:

On PC1, the user can only see their department file, which is the expected behavior.
On PC2, the same user can see all department files, which is not intended.
Troubleshooting Steps Taken:

Checked and compared the Control Panel settings and user management on both PCs – they are identical.
Verified the Active Directory settings for the user – everything seems correct.
Ensured that NTFS and shared folder permissions are set correctly on the file server.
Refreshed Group Policy settings using gpupdate /force on both PCs.
Question:
What could be causing this discrepancy in file access permissions between the two PCs, and how can I fix it so that both PCs enforce the same access restrictions?

Any advice on further troubleshooting steps or potential fixes would be greatly appreciated!