core: only change the nonce if the account nonce is lower

core/transaction_pool.go

@@ -69,9 +69,11 @@ func (pool *TxPool) Start() {
 
 		for _, tx := range pool.pending {
 			if addr, err := tx.From(); err == nil {
+				if pool.state.GetNonce(addr) < tx.Nonce() {
 					pool.state.SetNonce(addr, tx.Nonce())
 				}
 			}
+		}
 
 		pool.checkQueue()
 		pool.mu.Unlock()