Missing messages usingSpring Integration amqp:outbound-channel-adapter on RabbitMQ - spring-integration

Question

On Publishing the message to Rabbit MQ Exchange, few of the messages are getting lost. For example, posted 10 messages only five got delivered to the binded queue and the rest 5 messages are lost. Please advice.
Below is Spring XML configuration for connection
<bean id="cachingConnectionFactory" class="org.springframework.amqp.rabbit.connection.CachingConnectionFactory" destroy-method="destroy">
<property name="addresses" value="example.com:8080"/>
<property name="username" value="guest" />
<property name="password" value="guest" />
<property name="virtualHost" value="guest-app" />
<property name="connectionTimeout" value="1000"/>
<property name="cacheMode" value="#{T(org.springframework.amqp.rabbit.connection.CachingConnectionFactory.CacheMode).CONNECTION}"/>
<property name="channelCacheSize" value="6000"/>
<property name="channelCheckoutTimeout" value="60000"/>
<property name="requestedHeartBeat" value="30"/>
<property name="publisherConfirms" value="true"/>
<property name="publisherReturns" value="true"/>
</bean>
Below is Rabbit Template Config
<rabbit:template id="amqpTemplate" connection-factory="cachingConnectionFactory" mandatory="true" retry-template="retryTemplate" />
<bean id="retryTemplate" class="org.springframework.retry.support.RetryTemplate">
<property name="backOffPolicy">
<bean class="org.springframework.retry.backoff.ExponentialBackOffPolicy">
<property name="initialInterval" value="500" />
<property name="multiplier" value="10.0" />
<property name="maxInterval" value="10000" />
</bean>
</property>
</bean>
<rabbit:admin connection-factory="cachingConnectionFactory" />
Below is for Publishing message
int:chain input-channel="output">
<int:header-enricher>
<int:header name="amqp_deliveryMode" value="PERSISTENT" type="org.springframework.amqp.core.MessageDeliveryMode"/>
</int:header-enricher>
<int-amqp:outbound-channel-adapter id="outboundAmqp" amqp-template="amqpTemplate" exchange-name-expression="headers['exchange']" routing-key-expression="headers['routingKey']" mapped-request-headers="*" confirm-correlation-expression="payload" confirm-ack-channel="msgResponse" confirm-nack-channel="msgResponse" return-channel="msgResponse"/>