Report generation and sub-OUs

Report generation and sub-OUs

Hello, when I generate report to just find all the accounts in an OU, but without ticking any of the sub-OUs, it still includes all the accounts in the sub-OUs. The process is Ad Reports --> User Reports --> All users then I choose the specific OUs to report from. Can anyone tell me where I'm going wrong?
 
Thanks for any help.

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