In an attempt to clean up some old servers that have broken in the public list, we have started upgrading our delisting system.
We kicked off this system a few days ago and had it running very slowly. However, some updates yesterday and a bug have forced us to stop the deletion process. Your server may still get delisted if we fail to generate new invites because of permissions issue. (Note: The bot is always offline, so don't worry if this is the case on your server).
If your server was delisted but is looking good, you can remove the message by editing your listing and hitting save.
We will resume work on this system over the weekend or starting on Monday.