Local version of community not synced

The only posts visible on the local instance of https://lemmy.ml/c/unixporn are the posts that existed when I added the community hours ago. And my post is not visible in the original community. I tried "Undetermined", "English", every langage and deselecting every language with the x. No language setting shows more posts. Sorry if this is more suitable for https://lemmy.ml/c/lemmy_support, but idk if this is a problem of this instance or something else