Unscheduled/unnecessary file poll when taskExecutor is not default taskScheduler

After one poll and process(hadler.handleFile sleep 5s then do real process), there are bunch of unscheduled polls although i set 1s delay . Is it an issue? log is attached.

Context:

Code:

---

        <integration:channel id="filesIn-1"/>
          <integration:inbound-channel-adapter id="inbound-channel-adapter-1" ref="pollableFileSource-1" channel="filesIn-1" >
            <integration:poller ref="filePoller-1" />
        </integration:inbound-channel-adapter>
       
        <file:outbound-channel-adapter id="filesOut-1"
                delete-source-files="true" filename-generator="fileNameGenerator"
                directory="${dealer_dir}">
        </file:outbound-channel-adapter>

        <integration:service-activator
                input-channel="filesIn-1" output-channel="filesOut-1" ref="handler" method="handleFile">
        </integration:service-activator>

        <integration:poller id="filePoller-1"
                max-messages-per-poll="2" default="false"
                trigger="fixedDelayTrigger-1" task-executor="taskExecutor-1">
                <integration:transactional transaction-manager="transactionManager"/>
        </integration:poller>
       
        <bean id="fixedDelayTrigger-1" class="org.springframework.scheduling.support.PeriodicTrigger"
                p:fixedRate="false">
                <constructor-arg value="1000"/>
        </bean>
        <bean id="taskExecutor-1"
                class="org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor"
                p:threadNamePrefix="orderTask-1_"
                p:waitForTasksToCompleteOnShutdown="true"
                p:maxPoolSize="1"                       
                >
        </bean>
 
    <bean id="pollableFileSource-1"
      class="org.springframework.integration.file.FileReadingMessageSource"
              p:directory="${dealer_dir}"
        p:scanner-ref="directoryFilterScanner-1"
        >
        <constructor-arg ref="lastModifiedFileComparator"/>       
    </bean>

      <bean id="directoryFilterScanner-1" class="c.f.fileprocess.DirectoryFilterScanner"
                p:dirFilter="g#{fileProcessDefinition.groupCodeParttern('1')}${environment}[0-9]{2}/in/OS">
                  <property name="filter">
                        <bean class="org.springframework.integration.file.filters.AcceptAllFileListFilter"/>
                </property>
        </bean>

---