So, I'm an administrator on a small community roleplay server which runs spigot and multicraft. (Just normal spigot as far as I'm aware.) Recently we updated our server to 1.13.2, and as for popular demand, we downgraded back to 1.12.2. (Most plugins are up to date, if not all) Now everyone's IPs are the same as the server's main IP (in Essentials), which is obviously a problem since we can't IP ban anybody. I really don't know what happened, and would like if anyone could shed some light in the situation. Thank you.