MariaDB Galera Cluster (master-master) does sync Tables but no data
Galera doesn't support but the InnoDB ENGINE (and XtraDB, which is essentially the same). While there is experimental support for MyISAM, by activating wsrep_replicate_myisam, that is not guarantee to work, as it is not transactional.

The DDL that you executed worked because they do not use the ROW format, but STATEMENT-based replication.

While we could hack and maybe make it work, it would work poorly. I highly recommend you to change the tables to InnoDB: ALTER TABLE your_table ENGINE=InnoDB, FORCE; After that, any change will be synced automatically as desired.

References:


MariaDB Galera Cluster limitations: https://mariadb.com/kb/en/mariadb/mariadb-galera-cluster-known-limitations/
Aria is not supported: https://groups.google.com/forum/#!msg/codership-team/-VTXuYVnbN0/d-v4NVTQDNwJ