Network of Brokers using 5.12.1 duplicate messages

[mtod]

I'm trying to setup a network of brokers using 3 servers running 5.12.1

For my test I have a single queue the receives messages that are then
content routed to a topic. The topic is subscribed to by 3 clients.

The system seems to be working except I keep getting this message: 

2015-10-19 16:11:57,709 | WARN  | Duplicate message add attempt rejected.
Destination: TOPIC://trfTrackingEvent, Message id:
ID:APPDEV041-57596-1445281015540-9:1:1:800:1 |
org.apache.activemq.store.kahadb.MessageDatabase | ActiveMQ Transport:
tcp:///XX.XXX.XX.XXX:59394@61616

Any idea why this is being reported?

My Brokers : (Broker_A, Broker_B, Broker_C)

My Broker_B Setup:

    <networkConnectors>
                <networkConnector name="linkToBrokerA" userName="xxx" 
password="xxx"
uri="static:(tcp://appdev041:61616)" networkTTL="3"/>
                <networkConnector name="linkToBrokerC" userName="xxx"
password="xxx" uri="static:(tcp://appdev043:61616)" networkTTL="3"/>
    </networkConnectors>

    <transportConnectors>
      <transportConnector name="openwire"
uri="tcp://0.0.0.0:61616?maximumConnections=1000&amp;wireFormat.maxFrameSize=104857600&amp;transport.useKeepAlive=true"/>
    <transportConnectors>

Thanks
Mike




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