CMON does not detect cluster nodes properly

I have a new MariaDB 10 cluser on 3 nodes and a dedicated machine for CMON.

I've installed ClusterControl from debian repo using apt, but am unable to add the existing cluster to ClusterControl properly.

The cluster gets added, all 3 nodes are listed on the Overview page, but on the Nodes page only 2 nodes are listed under "Your Galera Nodes", and the remaining is only listed under "Your Master Nodes". I also get a warning "Cluster has an even number of Galera nodes. Add a garbd (Galera arbitrator), another node or remove a node to have an odd number number of nodes."

Furthermore, although on the Overview page under "Galera Nodes" all 3 are listed, most of the columns (State, Cluster Status, WSREP Ready, etc.) are saying "undefined".

I can confirm that the cmon user is able to ssh and sudo to all 3 nodes and the cmon server without a password.

I was following http://www.severalnines.com/ccg/23-add-existing-servercluster

See attached screenshots for example.

I'm using a community edition.

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CMON does not detect cluster nodes properly

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