My wife has tried to re-arrange her favourites in IE 11, but her changes (a deleted folder, several page references moved to new folders etc) last only for a few seconds before old references reappear.  For example a deleted folder reappears, page references that are moved reappear in the old position (as well as the new).

As a workaround, I have turned off Windows 10 sync settings for IE.  While this allows the maintenance to happen it is a workaround - not a solution.  Can anyone point me to the problem cause and solution?  Google has been no help - search results don't deal with this specific problem.

Thanks in advance...