Servers are bugged, but you can try the following to see if it will release you from your current group.
1) If you're platform is PC (Windows), open a command prompt and run these commands one at a time. Type cmd in your search field to bring the CLI utility up.
ipconfig /release
ipconfig /flushdns
ipconfig /renew
2) Log back in and see if you're still in group.
Good luck