could I suggest creating a new user profile.
make it an Administrator (or course) rather than a Standard User, then log out of that 'corrupted' account and into the new one.
setup your personal choices (background, screen saver blah blah blah) then go into File Explorer, C:\Users\
old account\ and for each of the personal folders (Docs, Pics, Vids, Music, Contacts, Favourites, Downloads, Desktop etc) copy the contents into the new user folder.
I suspect you will still copy over the dups that are weirdly 'syncing' between those two folders but once copied, you can go into the relevant folders and delete the dups (do one file first just to prove the 'sync' link really is broken).
once you are happy all the personal stuff is transferred, you can delete the whole, old account.
but maybe wait a week or so (and space permitting) just to make sure everything was transferred.
and don't forget your emails if you use a PC based email program.
the old account can always be left on the system but deactived so you won't see it as a choice at the login screen if you like via the elevated command
net user oldname /active:no
the beauty of creating a new user account approach
(which should work) eliminates the need for a fresh install of Windows - which if the PC is more than a couple of years old, would also give other benefits like a speed boost so keep it in the back of your mind down the track.