Unmatched acknowledege exception when purging a queue.

Issue

Async exception with no exception listener: javax.jms.JMSException: Unmatched acknowledege: 
MessageAck {commandId = 133126, responseRequired = false, ackType = 2, consumerId = ID:rtgs-
prdcom02.romtracplc.local-56549-1236855505242-0:0:33:4807, firstMessageId = null, 
lastMessageId = ID:rtgs-prdcom02.romtracplc.local-56549-1236855505242-0:0:36:1:3081, 
destination = queue://device.firstConfigMessage, transactionId = null, messageCount = 1};

Expected message count (1) differs from count in dispatched-list (498) at org.apache.activemq.broker.region.PrefetchSubscription.assertAckMatchesDispatched(PrefetchSubscription.java:443)
at org.apache.activemq.broker.region.PrefetchSubscription.acknowledge(PrefetchSubscription.java:192)
at org.apache.activemq.broker.region.AbstractRegion.acknowledge(AbstractRegion.java:377)
at org.apache.activemq.broker.region.RegionBroker.acknowledge(RegionBroker.java:462)
at org.apache.activemq.broker.TransactionBroker.acknowledge(TransactionBroker.java:194)
at org.apache.activemq.broker.BrokerFilter.acknowledge(BrokerFilter.java:74)
at org.apache.activemq.broker.BrokerFilter.acknowledge(BrokerFilter.java:74)
at org.apache.activemq.broker.MutableBrokerFilter.acknowledge(MutableBrokerFilter.java:85)
at org.apache.activemq.broker.TransportConnection.processMessageAck(TransportConnection.java:458)
at org.apache.activemq.command.MessageAck.visit(MessageAck.java:205)
at org.apache.activemq.broker.TransportConnection.service(TransportConnection.java:305)
at org.apache.activemq.broker.TransportConnection$1.onCommand(TransportConnection.java:179)
at org.apache.activemq.transport.TransportFilter.onCommand(TransportFilter.java:68)
at org.apache.activemq.transport.WireFormatNegotiator.onCommand(WireFormatNegotiator.java:143)
at org.apache.activemq.transport.InactivityMonitor.onCommand(InactivityMonitor.java:206)
at org.apache.activemq.transport.TransportSupport.doConsume(TransportSupport.java:84) at org.apache.activemq.transport.tcp.TcpTransport.doRun(TcpTransport.java:203) at org.apache.activemq.transport.tcp.TcpTransport.run(TcpTransport.java:185) at java.lang.Thread.run(Thread.java:595)