MichaelSD wrote
UPDATE: interesting developments. Out of the 5 animals, only one, the latest, has this mysterious event.
ADDENDUM: the meta folder has all pages listed, attic has the old versions and cached has them cached.
You may be able to restore your pages, one at a time, if you know their names. Access the page in the browser's location box or link to the page, and you should see the Old Revisions Icon. Open the most recent revision and save. Of course I don't know how many pages are involved.