If you move a WordPress installation with the WordPress Toolkit, the GUIDs are not updated. The GUIDs are used by WordPress in the RSS feeds.
If you want to drag the GUIDs, you can do it again with the following SQL command:
UPDATE wp_posts SET guid = REPLACE (guid, 'https://old-domain.com', 'https://new-domain.com');
wp_posts must of course be replaced by the actual table name if you use a cryptic table prefix.