diff --git a/precompiles/avs/query.go b/precompiles/avs/query.go
index dbf99060f..00cb46213 100644
--- a/precompiles/avs/query.go
+++ b/precompiles/avs/query.go
@@ -4,6 +4,7 @@ import (
 	"errors"
 	"fmt"
 	"strconv"
+	"strings"
 
 	errorsmod "cosmossdk.io/errors"
 
@@ -66,7 +67,7 @@ func (p Precompile) GetOptedInOperatorAccAddrs(
 		return nil, fmt.Errorf(exocmn.ErrContractInputParaOrType, 0, "string", addr)
 	}
 
-	list, err := p.avsKeeper.GetOperatorKeeper().GetOptedInOperatorListByAVS(ctx, addr.String())
+	list, err := p.avsKeeper.GetOperatorKeeper().GetOptedInOperatorListByAVS(ctx, strings.ToLower(addr.String()))
 	if err != nil {
 		return nil, err
 	}
@@ -115,7 +116,7 @@ func (p Precompile) GetOperatorOptedUSDValue(
 	if !ok {
 		return nil, fmt.Errorf(exocmn.ErrContractInputParaOrType, 1, "string", operatorAddr)
 	}
-	amount, err := p.avsKeeper.GetOperatorKeeper().GetOperatorOptedUSDValue(ctx, avsAddr.String(), operatorAddr)
+	amount, err := p.avsKeeper.GetOperatorKeeper().GetOperatorOptedUSDValue(ctx, strings.ToLower(avsAddr.String()), operatorAddr)
 	if err != nil {
 		if errors.Is(err, avstype.ErrNoKeyInTheStore) {
 			return method.Outputs.Pack(common.Big0)
diff --git a/precompiles/avs/tx.go b/precompiles/avs/tx.go
index d9eba78fd..4929fed78 100644
--- a/precompiles/avs/tx.go
+++ b/precompiles/avs/tx.go
@@ -360,6 +360,10 @@ func (p Precompile) OperatorSubmitTask(
 	}
 	resultParams.TaskResponse = taskResponse
 
+	if len(taskResponse) == 0 {
+		resultParams.TaskResponse = nil
+	}
+
 	blsSignature, ok := args[3].([]byte)
 	if !ok {
 		return nil, fmt.Errorf(exocmn.ErrContractInputParaOrType, 3, "[]byte", blsSignature)
diff --git a/x/operator/keeper/operator.go b/x/operator/keeper/operator.go
index 86a9975ad..97b073acd 100644
--- a/x/operator/keeper/operator.go
+++ b/x/operator/keeper/operator.go
@@ -2,6 +2,7 @@ package keeper
 
 import (
 	"fmt"
+	"strings"
 
 	errorsmod "cosmossdk.io/errors"
 
@@ -106,7 +107,7 @@ func (k *Keeper) HandleOptedInfo(ctx sdk.Context, operatorAddr, avsAddr string,
 		return errorsmod.Wrap(err, "HandleOptedInfo: error occurred when parse acc address from Bech32")
 	}
 	store := prefix.NewStore(ctx.KVStore(k.storeKey), operatortypes.KeyPrefixOperatorOptedAVSInfo)
-	infoKey := assetstype.GetJoinedStoreKey(operatorAddr, avsAddr)
+	infoKey := assetstype.GetJoinedStoreKey(operatorAddr, strings.ToLower(avsAddr))
 	// get info from the store
 	value := store.Get(infoKey)
 	if value == nil {
@@ -130,7 +131,7 @@ func (k *Keeper) SetOptedInfo(ctx sdk.Context, operatorAddr, avsAddr string, inf
 	if err != nil {
 		return assetstype.ErrInvalidOperatorAddr
 	}
-	infoKey := assetstype.GetJoinedStoreKey(operatorAddr, avsAddr)
+	infoKey := assetstype.GetJoinedStoreKey(operatorAddr, strings.ToLower(avsAddr))
 
 	bz := k.cdc.MustMarshal(info)
 	store.Set(infoKey, bz)
@@ -143,7 +144,7 @@ func (k *Keeper) GetOptedInfo(ctx sdk.Context, operatorAddr, avsAddr string) (in
 		return nil, errorsmod.Wrap(err, "GetOptedInfo: error occurred when parse acc address from Bech32")
 	}
 	store := prefix.NewStore(ctx.KVStore(k.storeKey), operatortypes.KeyPrefixOperatorOptedAVSInfo)
-	infoKey := assetstype.GetJoinedStoreKey(operatorAddr, avsAddr)
+	infoKey := assetstype.GetJoinedStoreKey(operatorAddr, strings.ToLower(avsAddr))
 	value := store.Get(infoKey)
 	if value == nil {
 		return nil, errorsmod.Wrap(operatortypes.ErrNoKeyInTheStore, fmt.Sprintf("GetOptedInfo: operator is %s, avs address is %s", opAccAddr, avsAddr))