activemq ramdomly re-deliver messages to consumer

[bwen]

All
I have a strange issue with activemq. I see sometimes it re-deliver the same
messages to consumers.
Sometimes this happens the same day, some times it happens after couple
days.
Here are my setups:
AMQ version 5.5.1 running active/backup mode 
using JDBC as persistent I can see messages are stored in activemq_msgs
table.
the url on consumer side is
 
<value>failover:(${jms.broker1.uri},${jms.broker2.uri})?randomize=false&amp;jms.prefetchPolicy.queuePrefetch=1&amp;maxReconnectAttempts=-1</value>

Is there anyone else see the similar issues and know how to fix it?

thanks in advance.





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