diff --git a/consensus/XDPoS/engines/engine_v2/engine.go b/consensus/XDPoS/engines/engine_v2/engine.go
index fc2866835e..bfaea96f3c 100644
--- a/consensus/XDPoS/engines/engine_v2/engine.go
+++ b/consensus/XDPoS/engines/engine_v2/engine.go
@@ -371,16 +371,16 @@ func (x *XDPoS_v2) verifyVotingRule(header *types.Header) error {
 }
 
 // Once Hot stuff voting rule has verified, this node can then send vote
-func (x *XDPoS_v2) sendVote(blockInfo utils.BlockInfo) error {
+func (x *XDPoS_v2) sendVote(blockInfo *utils.BlockInfo) error {
 	// First step: Generate the signature by using node's private key(The signature is the blockInfo signature)
 	// Second step: Construct the vote struct with the above signature & blockinfo struct
 	// Third step: Send the vote to broadcast channel
-	signedHash, err := x.signSignature(utils.VoteSigHash(&blockInfo))
+	signedHash, err := x.signSignature(utils.VoteSigHash(blockInfo))
 	if err != nil {
 		return err
 	}
 	voteMsg := &utils.Vote{
-		ProposedBlockInfo: blockInfo,
+		ProposedBlockInfo: *blockInfo,
 		Signature:         signedHash,
 	}
 	x.broadcastToBftChannel(voteMsg)
diff --git a/consensus/XDPoS/utils/pool_test.go b/consensus/XDPoS/utils/pool_test.go
index 208cbbff14..55ab8adde8 100644
--- a/consensus/XDPoS/utils/pool_test.go
+++ b/consensus/XDPoS/utils/pool_test.go
@@ -28,22 +28,36 @@ func TestPoolWithTimeout(t *testing.T) {
 	timeout1 := Timeout{Round: 1, Signature: []byte{1}}
 	timeout2 := Timeout{Round: 1, Signature: []byte{2}}
 	timeout3 := Timeout{Round: 1, Signature: []byte{3}}
-	assert.Nil(pool.Add(&timeout1))
-	assert.Nil(pool.Add(&timeout1))
-	assert.Equal(ret, 0)
-	assert.Nil(pool.Add(&timeout2))
-	assert.Equal(ret, 2)
-	assert.Nil(pool.Add(&timeout3))
-	assert.Equal(ret, 2)
+	_, numOfItems, err := pool.Add(&timeout1)
+	assert.Nil(err)
+	assert.Equal(1, numOfItems)
+	_, numOfItems, err = pool.Add(&timeout1)
+	assert.Nil(err)
+	// Duplicates should not be added
+	assert.Equal(1, numOfItems)
+	assert.Equal(0, ret)
+	_, numOfItems, err = pool.Add(&timeout2)
+	assert.Nil(err)
+	assert.Equal(2, ret)
+
+	_, numOfItems, err = pool.Add(&timeout3)
+	assert.Nil(err)
+	assert.Equal(2, ret)
 	pool = NewPool(3) // 3 is the cert size
 	ret = 0
 	pool.SetOnThresholdFn(onThresholdFn)
-	assert.Nil(pool.Add(&timeout1))
-	assert.Nil(pool.Add(&timeout2))
+	_, numOfItems, err = pool.Add(&timeout1)
+	assert.Nil(err)
+	assert.Equal(1, numOfItems)
+	_, numOfItems, err = pool.Add(&timeout2)
+	assert.Nil(err)
+	assert.Equal(2, numOfItems)
 	assert.Equal(ret, 0)
 	pool.Clear()
-	assert.Nil(pool.Add(&timeout3))
-	assert.Equal(ret, 0)
+	_, numOfItems, err = pool.Add(&timeout3)
+	assert.Nil(err)
+	assert.Equal(1, numOfItems)
+	assert.Equal(0, ret)
 }
 
 func TestPoolWithVote(t *testing.T) {
@@ -68,29 +82,63 @@ func TestPoolWithVote(t *testing.T) {
 	vote1 := Vote{ProposedBlockInfo: blockInfo1, Signature: []byte{1}}
 	vote2 := Vote{ProposedBlockInfo: blockInfo2, Signature: []byte{2}}
 	vote3 := Vote{ProposedBlockInfo: blockInfo1, Signature: []byte{3}}
-	assert.Nil(pool.Add(&vote1))
-	assert.Nil(pool.Add(&vote1))
+	_, numOfItems, err := pool.Add(&vote1)
+	assert.Nil(err)
+	assert.Equal(1, numOfItems)
+	// Duplicates should not be added
+	_, numOfItems, err = pool.Add(&vote1)
+	assert.Nil(err)
+	assert.Equal(1, numOfItems)
 	assert.Equal(ret, 0)
-	assert.Nil(pool.Add(&vote2))
-	assert.Equal(ret, 0)
-	assert.Nil(pool.Add(&vote3))
-	assert.Equal(ret, 2)
+
+	_, numOfItems, err = pool.Add(&vote2)
+	assert.Nil(err)
+	// vote2 is on a different blockInfo to vote1
+	assert.Equal(1, numOfItems)
+	assert.Equal(0, ret)
+
+	_, numOfItems, err = pool.Add(&vote3)
+	assert.Nil(err)
+	assert.Equal(2, numOfItems)
+
+	assert.Equal(2, ret)
 	pool = NewPool(3) // 3 is the cert size
 	ret = 0
 	pool.SetOnThresholdFn(onThresholdFn)
-	assert.Nil(pool.Add(&vote1))
-	assert.Nil(pool.Add(&vote2))
-	assert.Nil(pool.Add(&vote3))
-	assert.Equal(ret, 0)
+
+	_, numOfItems, err = pool.Add(&vote1)
+	assert.Nil(err)
+	assert.Equal(1, numOfItems)
+
+	// vote2 is on a different blockInfo to vote1
+	_, numOfItems, err = pool.Add(&vote2)
+	assert.Nil(err)
+	assert.Equal(1, numOfItems)
+
+	_, numOfItems, err = pool.Add(&vote3)
+	assert.Nil(err)
+	assert.Equal(2, numOfItems)
+
+	assert.Equal(0, ret)
 	pool.Clear()
 	assert.Empty(pool.objList)
 	pool = NewPool(2) // 2 is the cert size
 	ret = 0
 	pool.SetOnThresholdFn(onThresholdFn)
-	assert.Nil(pool.Add(&vote1))
-	assert.Nil(pool.Add(&vote2))
-	assert.Nil(pool.Add(&vote3))
-	assert.Equal(len(pool.objList), 1) //vote for one hash is cleared, but another remains
+
+	_, numOfItems, err = pool.Add(&vote1)
+	assert.Nil(err)
+	assert.Equal(1, numOfItems)
+
+	// vote2 is on a different blockInfo to vote1
+	_, numOfItems, err = pool.Add(&vote2)
+	assert.Nil(err)
+	assert.Equal(1, numOfItems)
+
+	_, numOfItems, err = pool.Add(&vote3)
+	assert.Nil(err)
+	assert.Equal(2, numOfItems)
+	assert.Equal(1, len(pool.objList)) //vote for one hash is cleared, but another remains
 	pool.Clear()
 	assert.Empty(pool.objList)
 }
diff --git a/tests/consensus/v2_test.go b/tests/consensus/v2_test.go
index 206f2725eb..59b53b4c73 100644
--- a/tests/consensus/v2_test.go
+++ b/tests/consensus/v2_test.go
@@ -100,7 +100,7 @@ func TestThrowErrorIfTimeoutMsgRoundLessThanCurrentRound(t *testing.T) {
 }
 
 // VoteHandler
-func TestVoteMessageHandlerSuccessfullyGenerateTCandSyncInfo(t *testing.T) {
+func TestVoteMessageHandlerSuccessfullyGeneratedQC(t *testing.T) {
 	blockchain, _, _, _ := PrepareXDCTestBlockChain(t, 11, params.TestXDPoSMockChainConfigWithV2Engine)
 	engineV2 := blockchain.Engine().(*XDPoS.XDPoS).EngineV2
 
@@ -129,7 +129,7 @@ func TestVoteMessageHandlerSuccessfullyGenerateTCandSyncInfo(t *testing.T) {
 	assert.Nil(t, err)
 	assert.Equal(t, utils.Round(1), engineV2.GetCurrentRound())
 
-	// Create a vote message that should trigger vite pool hook
+	// Create a vote message that should trigger vote pool hook
 	voteMsg = &utils.Vote{
 		ProposedBlockInfo: *blockInfo,
 		Signature:         []byte{3},
@@ -202,7 +202,7 @@ func TestProcessVoteMsgThenTimeoutMsg(t *testing.T) {
 	assert.Nil(t, err)
 	assert.Equal(t, utils.Round(1), engineV2.GetCurrentRound())
 
-	// Create a vote message that should trigger vite pool hook
+	// Create a vote message that should trigger vote pool hook
 	voteMsg = &utils.Vote{
 		ProposedBlockInfo: *blockInfo,
 		Signature:         []byte{3},