请教买卖问题

OnBar(ArrayRef<Integer> indexs) { MinPoint = MinMove*PriceScale; MyEntryPrice = AvgEntryPrice; i_offset = offset*MinMove*PriceScale; AA = CrossOver(High,BuyPosition); BB = CrossUnder(LOW,SellPosition); If(Time == 0.0935) {Sign1 = Close[1];} IF (sign1 != 0) { BuyPosition = sign1 + X1; SellPosition = sign1 - X1; } PlotNumeric("BuyPosition",BuyPosition); PlotNumeric("SellPosition",SellPosition); If(CurrentBar > 44*Max(Mday,Nday)){ If(MarketPosition == 0 And AA And Time >= 0.0935) { Buy(lots,Max(Open,BuyPosition)+i_offset); Return; } If(MarketPosition == 0 And BB And Time >= 0.0935) { SellShort(lots,Min(Open,SellPosition)-i_offset); Return; }第一张图为啥没穿过上轨也有信号第二张和第三张图是穿过了上轨没信号，但是有些时候又有信号，哪里有问题？求大神