I don't think I'm 'grokking' how the fediverse works. (Or at least, how following federated accounts works)

I'm taking some time to set up a mastodon account, and am currently confused about how following other federated accounts is supposed to work.

Let's use https://lemmy.world/c/comicstrips as an example. I go to that link and I see posts from other federated sites, as well as posts made directly on lemmy.world (I presume). I can also view all posts from that community in r.nf as well (https://r.nf/c/comicstrips@lemmy.world). I see all the same posts from the lemmy link.

What I don't understand is why, when I follow @comicstrips@lemmy.world on mastodon I only ever am shown replies and boosts from the account. I don't see the original image post, which I was expecting.

What am I missing? For what it's worth I'm using Phanpy to interact with mastodon, but am experiencing the same behavior on mastodon.social as well.