Why do files on my PC keep reverting to previous versions?

[Microsoft Windows]

I keep having an issue where files will 'forget' all the progress I made on them. I know that I saved the files because it happened to a file that I copied to somewhere else in my computer. I had a revision history, and working document folder. I copied from the working document to the revision history folder, both files date modified said '2/12/2025 11:52 PM'. An hour later, the document in the working document folder now said '2/10/2025 10:11 AM', and was missing the progress I had made, but the document in the revisions folder was up to date.

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