Customers environment has Windows Settings\Folder Redirection setup for Documents or other folders. 

If UPM is also in use, the redirected folder might get a duplicate copy after UPM processes the logon. This is by design and expected.

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Workaround #1:  Delete the redirected folder from the "default" user profile. (However, second logon might still create the folder).
Workaround #2: Create utility to remove duplicate folder from user profile after creation.

Please note both of the above are workarounds and not Citrix recommendations or supported methods with UPM.

Citrix does not recommend using UPM in conjunction with any other profile management solution.

This article describes the support of UPM for already redirected folders using Microsoft profile management or folder redirect GPO.