Cloned Logstash installation identity overlapping in Monitoring

Just installed 2 new logstash-nodes, cloned them in vmware. Hostnames, ip's and nodenames in logstash.yml are ok, but in Kibana monitoring, these new nodes are overlapping oddly in logstash monitoring.

There is somethimes the first node with the correct name, then it disappears and the second node is there for a while, but when I click it, it goes to the first node statistics, so I quess there is some kind of node id that is now same on both logstash installations...

Any idea where this might be or what else could be causing this?

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