Contact the moderators about it and they'll help you. Posts get flagged for spam and removed automatically by bots. In some cases it can be because it looks like you're sharing personal information (email addresses, phone numbers, etc.), in some other cases it might be because you share invites, etc. In your case, the IP addresses may have been assumed to be personal info. But if you contact the community mods, they should be able to lift the spam flag.
