策略与图表不符

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。