diff --git a/eth/api.go b/eth/api.go
index 1a14c555ae79..37a9730a138d 100644
--- a/eth/api.go
+++ b/eth/api.go
@@ -836,6 +836,19 @@ func (api *ScrollAPI) CalculateRowConsumptionByBlockNumber(ctx context.Context,
 
 // SetRollupEventSyncedL1Height sets the synced L1 height for rollup event synchronization
 func (api *ScrollAPI) SetRollupEventSyncedL1Height(height uint64) error {
+	prevHeightPtr := rawdb.ReadRollupEventSyncedL1BlockNumber(api.eth.ChainDb())
+
+	if prevHeightPtr == nil {
+		log.Warn("No previous rollup event synced L1 height found in database")
+		return fmt.Errorf("no previous rollup event synced L1 height found in database")
+	}
+
+	prevHeight := *prevHeightPtr
+	if height >= prevHeight {
+		log.Warn("New rollup event synced L1 height is not lower than previous height", "newHeight", height, "prevHeight", prevHeight)
+		return fmt.Errorf("new rollup event synced L1 height (%d) is not lower than previous height (%d)", height, prevHeight)
+	}
+
 	log.Info("Setting rollup event synced L1 height", "height", height)
 	rawdb.WriteRollupEventSyncedL1BlockNumber(api.eth.ChainDb(), height)
 	return nil
@@ -843,7 +856,20 @@ func (api *ScrollAPI) SetRollupEventSyncedL1Height(height uint64) error {
 
 // SetL1MessageSyncedL1Height sets the synced L1 height for L1 message synchronization
 func (api *ScrollAPI) SetL1MessageSyncedL1Height(height uint64) error {
-	rawdb.WriteSyncedL1BlockNumber(api.eth.ChainDb(), height)
+	prevHeightPtr := rawdb.ReadSyncedL1BlockNumber(api.eth.ChainDb())
+
+	if prevHeightPtr == nil {
+		log.Warn("No previous L1 message synced L1 height found in database")
+		return fmt.Errorf("no previous L1 message synced L1 height found in database")
+	}
+
+	prevHeight := *prevHeightPtr
+	if height >= prevHeight {
+		log.Warn("New L1 message synced L1 height is not lower than previous height", "newHeight", height, "prevHeight", prevHeight)
+		return fmt.Errorf("new L1 message synced L1 height (%d) is not lower than previous height (%d)", height, prevHeight)
+	}
+
 	log.Info("Setting L1 message synced L1 height", "height", height)
+	rawdb.WriteSyncedL1BlockNumber(api.eth.ChainDb(), height)
 	return nil
 }