Either that number was wrong like you say OR (and I am unfamiliar with Bluesky) the URL is loaded via Bluesky's browser (like X) and therefore Bluesky's own ser

Either that number was wrong like you say OR (and I am unfamiliar with Bluesky) the URL is loaded via Bluesky's browser (like X) and therefore Bluesky's own server IP was used (instead of the user's). Edit: Or (and more likely) cached/copies of the original.