method ethClient.SubscribeFilterLogs got event log twice

[van-bright]

System information

PlatON version: platon version 1.1.0
OS & Version:Linux
Commit hash : (if develop)

Expected behaviour

When target event filtered, there should be noticed only once

Actual behaviour

got noticed twice

Steps to reproduce the behaviour

1. write some code like below to subscribe event for contract:

package main

import (
    "context"
    "fmt"
    "log"
    "strings"
    "math/big"

    "github.com/PlatONnetwork/PlatON-Go/crypto"
    "github.com/PlatONnetwork/PlatON-Go"
    "github.com/PlatONnetwork/PlatON-Go/common"
    "github.com/PlatONnetwork/PlatON-Go/accounts/abi"
    "github.com/PlatONnetwork/PlatON-Go/core/types"
    "github.com/PlatONnetwork/PlatON-Go/ethclient"
)

func main() {
    client, err := ethclient.Dial("wss://devnetopenapi.platon.network/ws")
    if err != nil {
        log.Fatal(err)
    }

    contractAddress := common.MustBech32ToAddress("lat1xt80enwhxtj2tspr48cv8q9t2sp6shx6klfvmf")
    query := platon.FilterQuery{
        Addresses: []common.Address{contractAddress},
    }

    logs := make(chan types.Log)
    sub, err := client.SubscribeFilterLogs(context.Background(), query, logs)
    if err != nil {
        log.Fatal(err)
    }

    for {
        select {
        case err := <-sub.Err():
            log.Fatal(err)
        case vLog := <-logs:
            fmt.Println(vLog) //  got noticed twice
        }
    }
}

2. trigger some events in the contract
3. got vLog noticed twice.

[benbaley]

fixed in #1868

[benbaley]

close by done