[arch-general] Different outputs for 'groups' and 'groups user'

Hi, not sure if this is the right place to ask this, let me know if it's not. Maybe this is normal, but couldn't clarify it by reading the Arch Wiki [1]: [user@arch ~]$ whoami user [user@arch ~]$ groups sys lp wheel ftp uucp log rfkill http games audio users user [user@arch ~]$ groups user sys lp wheel ftp uucp log rfkill http games audio users realtime user Why different outputs? Is it normal and with no issues? Should I do something? Thanks a lot! [1] https://wiki.archlinux.org/index.php/Users_and_groups#Group_management