diff --git a/pulsar-broker/src/main/java/org/apache/pulsar/broker/service/Consumer.java b/pulsar-broker/src/main/java/org/apache/pulsar/broker/service/Consumer.java
index 8924b750eb624..a7c06d0c85d63 100644
--- a/pulsar-broker/src/main/java/org/apache/pulsar/broker/service/Consumer.java
+++ b/pulsar-broker/src/main/java/org/apache/pulsar/broker/service/Consumer.java
@@ -444,6 +444,7 @@ public CompletableFuture<Void> messageAcked(CommandAck ack) {
     private CompletableFuture<Long> individualAckNormal(CommandAck ack, Map<String, Long> properties) {
         List<Position> positionsAcked = new ArrayList<>();
         long totalAckCount = 0;
+        boolean individualAck = false;
         for (int i = 0; i < ack.getMessageIdsCount(); i++) {
             MessageIdData msgId = ack.getMessageIdAt(i);
             PositionImpl position;
@@ -467,14 +468,18 @@ private CompletableFuture<Long> individualAckNormal(CommandAck ack, Map<String,
             } else {
                 position = PositionImpl.get(msgId.getLedgerId(), msgId.getEntryId());
                 ackedCount = getAckedCountForMsgIdNoAckSets(batchSize, position, ackOwnerConsumer);
+                individualAck = true;
             }
 
-            addAndGetUnAckedMsgs(ackOwnerConsumer, -(int) ackedCount);
-
+            if (individualAck) {
+                if (checkCanRemovePendingAcksAndHandle(position, msgId)) {
+                    addAndGetUnAckedMsgs(ackOwnerConsumer, -(int) ackedCount);
+                }
+            } else {
+                addAndGetUnAckedMsgs(ackOwnerConsumer, -(int) ackedCount);
+            }
             positionsAcked.add(position);
 
-            checkCanRemovePendingAcksAndHandle(position, msgId);
-
             checkAckValidationError(ack, position);
 
             totalAckCount += ackedCount;
@@ -636,10 +641,11 @@ private void checkAckValidationError(CommandAck ack, PositionImpl position) {
         }
     }
 
-    private void checkCanRemovePendingAcksAndHandle(PositionImpl position, MessageIdData msgId) {
+    private boolean checkCanRemovePendingAcksAndHandle(PositionImpl position, MessageIdData msgId) {
         if (Subscription.isIndividualAckMode(subType) && msgId.getAckSetsCount() == 0) {
-            removePendingAcks(position);
+            return removePendingAcks(position);
         }
+        return false;
     }
 
     private Consumer getAckOwnerConsumer(long ledgerId, long entryId) {
@@ -886,7 +892,7 @@ public int hashCode() {
      *
      * @param position
      */
-    private void removePendingAcks(PositionImpl position) {
+    private boolean removePendingAcks(PositionImpl position) {
         Consumer ackOwnedConsumer = null;
         if (pendingAcks.get(position.getLedgerId(), position.getEntryId()) == null) {
             for (Consumer consumer : subscription.getConsumers()) {
@@ -907,7 +913,7 @@ private void removePendingAcks(PositionImpl position) {
         if (ackedPosition != null) {
             if (!ackOwnedConsumer.getPendingAcks().remove(position.getLedgerId(), position.getEntryId())) {
                 // Message was already removed by the other consumer
-                return;
+                return false;
             }
             if (log.isDebugEnabled()) {
                 log.debug("[{}-{}] consumer {} received ack {}", topicName, subscription, consumerId, position);
@@ -921,7 +927,9 @@ private void removePendingAcks(PositionImpl position) {
                 ackOwnedConsumer.blockedConsumerOnUnackedMsgs = false;
                 flowConsumerBlockedPermits(ackOwnedConsumer);
             }
+            return true;
         }
+        return false;
     }
 
     public ConcurrentLongLongPairHashMap getPendingAcks() {
diff --git a/pulsar-broker/src/test/java/org/apache/pulsar/broker/service/BrokerServiceTest.java b/pulsar-broker/src/test/java/org/apache/pulsar/broker/service/BrokerServiceTest.java
index 1135e2c8ff4e7..34d1d15764d39 100644
--- a/pulsar-broker/src/test/java/org/apache/pulsar/broker/service/BrokerServiceTest.java
+++ b/pulsar-broker/src/test/java/org/apache/pulsar/broker/service/BrokerServiceTest.java
@@ -1435,4 +1435,30 @@ public void testDynamicConfigurationsForceDeleteTenantAllowed() throws Exception
             assertTrue(conf.isForceDeleteTenantAllowed());
         });
     }
+
+    @Test
+    public void testDuplicateAcknowledgement() throws Exception {
+        final String ns = "prop/ns-test";
+
+        admin.namespaces().createNamespace(ns, 2);
+        final String topicName = "persistent://prop/ns-test/duplicated-acknowledgement-test";
+        @Cleanup
+        Producer<byte[]> producer = pulsarClient.newProducer()
+                .topic(topicName)
+                .create();
+        @Cleanup
+        Consumer<byte[]> consumer1 = pulsarClient.newConsumer()
+                .topic(topicName)
+                .subscriptionName("sub-1")
+                .acknowledgmentGroupTime(0, TimeUnit.SECONDS)
+                .subscriptionType(SubscriptionType.Shared)
+                .isAckReceiptEnabled(true)
+                .subscribe();
+        producer.send("1".getBytes(StandardCharsets.UTF_8));
+        Message<byte[]> message = consumer1.receive();
+        consumer1.acknowledge(message);
+        consumer1.acknowledge(message);
+        assertEquals(admin.topics().getStats(topicName).getSubscriptions()
+                .get("sub-1").getUnackedMessages(), 0);
+    }
 }