Why does my file folders on desktop and downloads revert when I make changes or move items to a newly created folder?

[Secretaire Municipale]

I have windows 11. When I created a copy of a file folder and then renamed it on desktop, adding older and newer docs and folders inside from previous works, the next day everything reverted. My old files were back in the old folders and the old main folder on desktop was back. The new folder only had the newly created docs. And my downloads folder, had gone back about 10 days. It was only luck I didn`t have anything important in the downloads. I can`t find any reason why. My anti-virus says there is no malware. Please help.

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