The link is taking you to the hosting website, startrek.website, rather than the local version of it.

Because each instance is its own independent website, going to the other websites is no different than going to any other unrelated site. You still need to log in to Etsy to shop, eBay to bid, and Amazon to leave reviews if you follow links from here.

The magic of the Fediverse is found in mirroring content across the network. This means you’re always interacting with a local copy of content. If that content originated on the site you’re using, it’s the original copy, and if it originated on a remote website, it’s a duplicate. And, as I state in a other comment above, the copying of remote content only starts from the point at which someone on your instance first subscribed to it. So, remote groups will almost always be forever incomplete, but after a week or two of being subscribed, it doesn’t actually matter.