ProxySQL hostgroup 10 and 11 - favouring 10 for reads/writes (XtraDB Cluster Operator)

Could be 11, could be 10, could be 1334454. The number itself doesn’t mean anything; it’s just a number.

Show us the contents of runtime_mysql_galera_hostgroups / mysql_galera_hostgroups tables. That will tell you which HG is which.

Yes, there should only be 1 writer in HG11 which should be a setting in the above table.