MarketPosition出了问题

老师您好，我的开仓出现了重复开多单，或重复开空单的现象，我把信号和MarketPosition打印出来，发现跟策略交易里的多仓和空仓对不上，多仓为1时，MarketPosition打印出来却是-1，还有一个问题，我把开仓保存到记录文件里，只有一个记录，有时候却产生两个委托，有时候会提示信号闪烁。这是什么原因呢？

            if (BarStatus == 2)
                Print(Text(SystemDateTime) + "," + Text(Date + Time) + "," + Symbol + ",Position=" + Text(MarketPosition) + ",BBIsStop=" + Text(BBIsStop) + ",BBDirection=" + Text(BBDirection));

            If (MarketPosition <> 1)
            {
                if (BBIsStop == 1 && BBDirection == 1)
                {
                    if (BarStatus == 2)
                        FileAppend("D:\\TB交易记录\\" + Symbol() + ".tbf", Text(SystemDateTime) + "," + Text(Date + Time) + "," + Symbol + ",平空开多," + Text(MarketPosition) + "," + Text(BBIsStop) + "," + Text(BBDirection));

                    Buy(AutoLots, Close);
                }
            }

            If (MarketPosition <> -1)
            {
                if (BBIsStop == 1 && BBDirection == -1)
                {
                    if (BarStatus == 2)
                        FileAppend("D:\\TB交易记录\\" + Symbol() + ".tbf", Text(SystemDateTime) + "," + Text(Date + Time) + "," + Symbol + ",平多开空," + Text(MarketPosition) + "," + Text(BBIsStop) + "," + Text(BBDirection));

                    SellShort(AutoLots, Close);
                }
            }