My instance isn't federating with others very well. What's wrong?

Hello! I recently got https://globe.pub up and running and I'd like to get it federated with other instances.

My https://globe.pub/instances page shows that globe.pub can talk to other instances, but it doesn't seem to be pulling in their full metadata properly – the Software or Version columns are entirely empty.

I am receiving some posts from other communities (see attached photo), but only three of them are sending posts my way at all. For any other communities, I am unable to view posts, even when I navigate to them manually, and I do not see any of their posts in my All feed.

I have no communities in my whitelist or blacklist, so my server should be configured to openly federate.

Does anyone know what might be going wrong here? What debugging tips should I try next to diagnose this issue?