If(MarketPosition <> -1 And Close[1] > high_rail[1] And Open <= high_rail[1] And !is_upper_limit)  //开空单
        {
            SellShort(positionlots, Open);
            PlotString("跳空", "跳空", Low, Red);
        }
        If(MarketPosition <> -1 And High > high_rail[1] And Low <= high_rail[1] And !is_upper_limit)
        {
            SellShort(positionlots, high_rail[1]);
            PlotString("实空", "实空", Low, Red);
        }

以上为开空单的代码，在十字星所在K线，为什么平了之后，没有再开空单。请协助排查。