Endnote Library back to progress from three months ago but up to date on online account

EndNote EndNote General
3

EndNote is not compatible with cloud storage locations like OneDrive:

https://support.clarivate.com/Endnote/s/article/EndNote-Reference-Manager-ProCite-Compatibility-with-Dropbox-and-other-Cloud-storage

I would suggest closing your library and creating a new library outside of OneDrive. With the new blank library open, click the Tools menu and select Sync. That will bring down the information from your online account.