AmazingWizard

Because different instances have different rules. And communities have their own rules. wait till you learn that you only see coversations from the people your instance federates with. You could be seeing half the comments of a thread if the federation overlap between your instance and the host instance are not exactly the same.

Then you need a new account I think. It's a limitation of the ActivityPub protocol I think (but I haven't done any reading). Your identity is tied to the instance it was created on.