Hi Joseph,
I'm an Independent Advisor and I'm happy to help you.
Creation date gets updated whenever the file gets "created" in your system. This means, downloaded or moved from an external drive. Onedrive when uploading and downloading files from the cloud could make your system recognize it as downloaded, therefore "Created" at the current timestamp.
I would suggest to put dates inside the document since file creation time is not a reliable source to check this.
I hope this helps!