Thanks, this might be on to something because I don't see a sh.itjust.works post on the lemm.ee version but I know beehaw defederated from them, and the community is a beehaw community. Maybe lemm.ee is pulling from beehaw.

But I don't think it fully explains the situation. Here's the post on beehaw:

https://beehaw.org/post/528754

For me that shows 17 comments, and I only see 13 on lemm.ee. But lemm.ee is defederated from fewer instances than beehaw, so what could explain that?

Edit: is it possible lemm.ee is simply not aware of all the instances?

You can click "Instances" at the bottom of the page on lemm.ee to see what lemm.ee has blocked. But I don't know how to tell what instances have blocked lemm.ee.