posts/comments aren't reaching feddit.uk - Lemmy.world

My posts and comments to feddit.uk [http://feddit.uk] communities aren’t going through. I can only see the posts and comments on this instance but not on feddit.uk [http://feddit.uk]. For example, this post [https://lemmy.world/post/3620607] doesn’t appear in https://feddit.uk/c/brighton [https://feddit.uk/c/brighton] Is there any technical problem or is one defederated with another?