I've heard from others that it's just lag. I think it's the same way from lemmy account browsing a kbin magazine, they just don't have that message. It does show up, just takes more time to sync up. I kind of ignore the message. I'm not sure what can be done to improve the experience, but idk, feel free to swap to lemmy, I haven't felt the consequence of that yet even though I'm mostly on kbin and browsing primarily lemmy communities.

It is kind of a sucky experience at the moment like if you google search something, and the article is from say lemmy.one, but you're on lemmy.world, then the link goes to lemmy.one, and you still can't actually make any comments/upvote/save, etc. You'd have to like prepend your lemmy.world site before it in some way so you can actually see the version of that article on your server and be able to interact. That extra step is definitely a con, but there could be ways to improve that in the future.

Like maybe there could be a website that lets you type in which server your account is on - say lemmy.world. Then you log in, without having to navigate to the correct website, and maybe when you do go to an article that's on lemmy.one, then when you go to that site, it checks if you're logged in to a fediverse server (maybe by checking a cookie?), and then takes you instead to the lemmy.world version of that lemmy.one article. I think there's possibilities that the UI experience can change in the future to not be more seamless