It might be related to the NSFW flag? If you're browsing without being logged in, I think the posts won't show up at all which is very confusing.
There have been federation issues before, and I've been thinking about moving the community over to discuss.online which has been very reliable for posting. I haven't yet, but if federation issues continue to be a problem I probably will. If anyone has opinions on that, I'd like to hear them. I'll probably also make a separate poll thread to see what people think.