It's meant to be a full mirror/clone of the Twitter account so it displays how many followers it has on Twitter.
Mastodon
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Not a bug. Also not a feature. Somewhere in between.
It's just a number in a database. If you are the server admin, there's no reason why you couldn't fiddle with it. When anyone asks for the profile, server sends what's in the database. They're doing the same thing with the Joined Date.
If it wasn't a bot specifically mirroring another platform's stuff, that kind of manipulative behavior might rub other server admins the wrong way.
Thank you for the explanation! It seems logical now, considering they host the server.
try sharing the post, it'll share a twitter link, it's supposed to be a very light and direct mirror