I've found a couple of lemmy groups on Pixelfed, but they didn't show any post. Also, what should I do to show the groups i moderate?

[Update] If I write the exact name of the group (like lovecraft_mythos@lemmy.world) it shows the page with the description, but still no posts.

I've also posted a picture in the group after following it, but it didn't show, except for the note about the last update