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
