Approximately an hour ago, an account of an administrator was hijacked. This resulted in an unauthorised user gaining access to various commands. The extent of the damage was that they griefed spawns, wiped some user balances, and killed players. No player data or personal information was stolen.
We have reverted the above data (balance, inventories, location and spawn worlds) to a backup taken ~30 minutes prior to the incident. If you did happen to experience an issue, then please create a support thread. There should have been no major data lost due to this.
Also, on a more positive note - you can now join with 1.16.1! Enjoy.