Lemmy Support

I've subscribed on my new instance lemmyfly.org to !lemmy_support@lemmy.ml. One post (by me) on there (postfix issues, possible to use sendgrid?) has 4 comments. But when I click on that post from my own server timeline, it shows an earlier state of the post with 0 comments.

Maybe I don't understand the federation well enough yet, but shouldn't the state of a post be similar no matter from which instance you look at it ?

edit: I see different comments on this post when looking at it direct on lemmy.ml/c/lemmy_support and on https://lemmyfly.org/c/lemmy_support@lemmy.ml

My own comment posted from lemmyfly.org, does not show under this post at lemmy.ml, only on my own instance ? This is why I edit the main post to write this. Is it supposed to work like this ?