The Starbound website explains that the Chucklefish Forums have been compromised, and that forum posts dating back to March have been lost since they were not backed up. They are keeping the forums offline for now while they work things out, and outline the following plan:

All of that said, here’s my current plan:

1. We’re keeping the forums offline while we fix things. This process may take awhile.
2. Rolling the entire forum back to March doesn’t make any sense – there’s an awful lot of discussion that’s happened since then that hasn’t been effected, as well as changes to the layout of the forums. It also doesn’t make sense to restore posts from March and put them right back where they were before, because… everyone would be responding to posts from March. I’d like to restore the posts from March and put them in an archive forum that people can refer back to.
3. We’re going to rebuild the sections of the forums that were lost and use this as an opportunity to improve them.
4. We’re updating Xenforo and taking steps to ensure that the forums are not vulnerable to future attacks.

This whole situation sucks. I’m sorry that a lot of your posts are gone, and I promise we’ll do better in the future.