adingbatponder on Nostr: Why does a person's #posts on another server, not appear in my browser 's right-hand ...

Why does a person's #posts on another server, not appear in my browser 's right-hand column in fosstodon.org ? I have to go to their server in a new browser window to see their posts. Then when I want to comment on a post in that browser window, their server has a pop-up & asks me which server I am on, & then lets me comment in a new browser window on fosstodon.org i.e. on a post that I was not able to see before. WHY ??????? ? How is thie good ? #Fediverse #Mastodon #Fosstodon