I had the same problem when creating an automated linked clone pool with persistent disks.  It was only happening with my profile so I knew it had something to do with the image and the fact that I had built it.  What I found was that if you look at your parent image and go to regedit, then go to

HKLM/SOFTWARE/MICROSOFT/WINDOWS NT/PROFILELIST - you will see in there a number of SIDS.  Check to see if one or a few of them belong to the user or users affected.  I removed my profile and I am no longer getting the duplicate profile.  This will save you from having to rebuild the image.

Hope this helps!

Rod