Hi,
How did you open the files from Office when saving in OneDrive? From Open list or local OneDrive folder?
I suggest you go to OneDrive settings (right-click the little cloud icon to the right of the taskbar and choose Settings)- find the Office tab and uncheck "Use Office 2016 to sync Office files that I open".
If you didn't find the option, try to reset OneDrive:
https://support.microsoft.com/en-us/office/reset-onedrive-34701e00-bf7b-42db-b960-84905399050c
In Office, you can remove the OneDrive service from File- Account and remove the account from connected services list, and then re-add the service:
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