The 'By' property in the version list is not updated with the user who copyed the page to the new position e.g. republished the page. It is the last user who published the page in the original position who is listed.
This allso applyes when moving a page.
Hello!
This issue has been fixed in 4.61 (#45351).
- "Changed behaviour so that Created, Saved, CreatedBy, SavedBy are set to new values when pages are copied."