图表信号未按照crossover\under逻辑执行

如上图所示，我的开仓逻辑是均线发生了crossunder就做空，但是图表里并没有发生crossunder，为何还是执行了做空操作？如果改掉这个问题要怎么写？代码如下：Params Numeric FastLength(10);// 短期指数平均线参数 Numeric midLength(20);// 中期指数平均线参数 Numeric SlowLength(60);// 长期指数平均线参数Vars Series<Numeric> AvgValue1; Series<Numeric> AvgValue2; Series<Numeric> AvgValue3; Numeric money; Numeric myprice; Series<Numeric> lots; Series<Numeric> lposition; Series<Numeric> sposition; Series<Numeric> trendy; Numeric exit;Events OnReady() { SetBackBarMaxCount(1+Max(slowLength,midLength)); } OnBar(ArrayRef<Integer> indexs) { AvgValue1 = AverageFC(Close,FastLength); AvgValue2 = AverageFC(Close,midLength); AvgValue3 = AverageFC(Close,SlowLength); PlotNumeric("MA1",AvgValue1); PlotNumeric("MA2",AvgValue2); PlotNumeric("MA3",AvgValue3); money = Portfolio_CurrentEquity * 0.1;//按总风险度的40%，每个品种均分投资额 myprice = Open;//这里使用open,更为精确的是使用委托价格 lots = IntPart(money/(myprice*contractunit*BigPointValue*MarginRatio)); //计算开仓手数 If(CrossOver( AvgValue2[1] , AvgValue3[1])) { trendy = 1; } if(CrossUnder(AvgValue2[1] , AvgValue3[1])) { trendy = -1; } if(CurrentBar >= Max(midLength,slowLength)) { If(MarketPosition <>1 && trendy == 1) { Buy(lots,Open); lposition = lots; } If(MarketPosition <>-1 && trendy == -1) { SellShort(lots,Open); sposition = lots; } } }