Random Old Photos

After installing a system update Photos may have rebuild your Photos Library to upgrade it to a newer format.

During this rebuilding Photos may detect lost and found older items that should have been deleted, but could not be deleted because of a library damage. Photos will collect such foundlings and show them in an album "Recovered items". Is there such an album or folder? If yes, check the items in it, if some of them are missing photos that need recovering, then delete the rest.

Hello ahp115,

Do you currently use iCloud Photos with any other device where your Apple ID may be signed in? Additionally, if you previously utilized My Photo Stream. Check out the changes and how you can access your photos with iCloud using the articles below.

About iCloud Photos and My Photo Stream - Apple Support

Information about the My Photo Stream shutdown - Apple Support

If needed, you can also use the steps here to help check other devices that may be using iCloud Photos with your Apple ID: Set up and use iCloud Photos - Apple Support

Cheers.