Steps to reproduce;
1. On one node of a cluster add a new group chat service. http://localhost:9090/muc-service-edit-form.jsp?create=true
2. Check the list of group chat services on the other node of the cluster
The group chat service is present on all nodes.
The group chat service is only present on the node where it was created.
Restart the other nodes in the cluster.
(reproducing the bug for deleting group chat services is left as an exercise for the reader)