This question is especially for people who have joined in the last week. Have you used other fediverse platforms or is this your first time really using one? What do you think of it so far? Are you aware that you can comment on Lemmy posts with a Mastodon account?
Someone please correct me if I’m wrong, but my understanding is the first time you search a @community@server your home Lemmy instance discovers it, and you will see future posts but not posts from before the discovery. It only takes one person in a Lemmy instance to discover a community for the whole instance to benefit. So if I was on the same Lemmy server as you and searched /discovered the community a week before, you would see 7 days of posts.
I think funny@server1 and funny@server2 are two separate communities which could be a good thing but also confusing to new users.