切换交易对后用GetRecords实时获取K线数据时遇到的问题

小白求问，想用切换交易对的方式获取不同币种的K线，代码如下：

function main() {
    LogReset();
    while (true) {
        exchange.IO("currency", "ETH");
        var curETH = exchange.GetCurrency();
        var recordsOfETH = exchange.GetRecords(PERIOD_M5);
        Log(curETH, "当前搜集到recordsOfETH的5(分钟)线数量", recordsOfETH.length, ":", recordsOfETH);
        exchange.IO("currency", "LTC");
        var curLTC = exchange.GetCurrency();
        var recordsOfLTC = exchange.GetRecords(PERIOD_M5);
        Log(curLTC, "当前搜集到recordsOfLTC的5(分钟)线数量", recordsOfLTC.length, ":", recordsOfLTC);
        exchange.IO("currency", "BTC");
        var curBTC = exchange.GetCurrency();
        var recordsOfBTC = exchange.GetRecords(PERIOD_M5);
        Log(curBTC, "当前搜集到recordsOfBTC的5(分钟)线数量", recordsOfBTC.length, ":", recordsOfBTC);
        Sleep(5000);
    }
}

但是在比特币交易所测试时获取的K线数据出现了重复的情况，图片如下 然后我在Okcoin上测试一切正常，如图 请问下各位大神这个问题是什么原因导致的呢,是我获取K线的方式不对么，还是因为是比特币交易所的K线是实时收集的问题么，实在没法定位问题了，烦请各位大神解答下！