MariaDB / MySQL galera cluster nodes won't join
From the show status output your servers don't load any wsrep provider (Galera), and probably don't even attempt to.
As little as I understand in how mysql configuration file works, I think you need to put [mysqld] before MariaDB/Galera settings (or put them immediately after InnoDB settings). Otherwise they seem to be in the [isamcheck] section and simply are not parsed by the server.