diff --git a/utils/bank.go b/utils/bank.go
index c8ceac806..bc749449b 100644
--- a/utils/bank.go
+++ b/utils/bank.go
@@ -122,7 +122,7 @@ func SanitizeCoins(coins []sdk.Coin) sdk.Coins {
 		if lastDenom != coin.Denom {
 			cleanCoins = append(cleanCoins, coin)
 		} else {
-			cleanCoins[len(cleanCoins)-1].Add(coin)
+			cleanCoins[len(cleanCoins)-1] = cleanCoins[len(cleanCoins)-1].Add(coin)
 		}
 		lastDenom = coin.Denom
 	}
diff --git a/utils/utils_test.go b/utils/utils_test.go
new file mode 100644
index 000000000..f4604b7e8
--- /dev/null
+++ b/utils/utils_test.go
@@ -0,0 +1,26 @@
+package utils_test
+
+import (
+	"testing"
+
+	sdk "github.com/cosmos/cosmos-sdk/types"
+	"github.com/stretchr/testify/require"
+
+	"github.com/neutron-org/neutron/v7/utils"
+)
+
+func TestSanitizeCoins(t *testing.T) {
+	input := sdk.Coins{
+		sdk.NewInt64Coin("atom", 10),
+		sdk.NewInt64Coin("btc", 50),
+		sdk.NewInt64Coin("atom", 5),
+		sdk.NewInt64Coin("btc", 0),
+	}
+	expected := sdk.Coins{
+		sdk.NewInt64Coin("atom", 15),
+		sdk.NewInt64Coin("btc", 50),
+	}
+
+	result := utils.SanitizeCoins(input)
+	require.Equal(t, expected, result)
+}