Date modified is changing with no interaction from user

[Windows 11]

Windows 11 23H2, dell desktopFile modified dates are changing on their own. Just today I had 33 files in which their modified date changed. I did none of them. They were all PDF files. Their original dates were varied, as shown in the properties window. some in dec of last year. Modifications were varied, early morning to just before I looked. Not certain what is causing this. Annoying when sorting by date for a file that I had just put in there. Any ideas?

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