为什么这个EA不能加仓？

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EA思路，在MA10、MA20、MA30上方，每收盘一根阳线，发一张多单，收盘价小于MA10时，多单平仓；在MA10、MA20、MA30下方，每收盘一根阴线，发一张空单，收盘价大于MA10时，空单平仓。但是目前只有在EA加载后，第一个信号发出时开仓，而不能加仓。求各位大神帮忙查看一下，感激不尽。
下面截图是EA源码：
//+------------------------------------------------------------------+
//|                                               Moving Average.mq4 |
//|                   Copyright 2005-2014, MetaQuotes Software Corp. |
//|                                              http://www.mql4.com |
//+------------------------------------------------------------------+
#property copyright   "2005-2014, MetaQuotes Software Corp."
#property link        "http://www.mql4.com"
#property description "Moving Average sample expert advisor"

#define MAGICMA  20131111
//--- Inputs
input double Lots          =0.02;
input double iLots         =0.02;  //追加订单开仓量
input int Order_Total      =1;     //最大持仓手数为1手
input double MaximumRisk   =0.02;
input double DecreaseFactor=3;
input int    MovingPeriod1  =10;
input int    MovingPeriod2  =20;
input int    MovingPeriod3  =30;
input int    MovingShift    =0;
input int    TicketNo;
input string ReturnMarketlnfomation;
input int    Open_New_Order;
//+------------------------------------------------------------------+
//| Calculate open positions                                         |
//+------------------------------------------------------------------+
int CalculateCurrentOrders(string symbol)
  {
   int buys=0,sells=0;
//---
   for(int i=0;i<OrdersTotal();i++)
     {
      if(OrderSelect(i,SELECT_BY_POS,MODE_TRADES)==false) break;
      if(OrderSymbol()==Symbol() && OrderMagicNumber()==MAGICMA)
        {
         if(OrderType()==OP_BUY)  buys++;
         if(OrderType()==OP_SELL) sells++;
        }
     }
//--- return orders volume
   if(buys>0) return(buys);
   else       return(-sells);
  }
//+------------------------------------------------------------------+
//| Calculate optimal lot size                                       |
//+------------------------------------------------------------------+
double LotsOptimized()
  {
   double lot=Lots;
   int    orders=HistoryTotal();     // history orders total
   int    losses=0;                  // number of losses orders without a break
//--- select lot size
   lot=NormalizeDouble(AccountFreeMargin()*MaximumRisk/1000.0,1);
//--- calcuulate number of losses orders without a break
   if(DecreaseFactor>0)
     {
      for(int i=orders-1;i>=0;i--)
        {
         if(OrderSelect(i,SELECT_BY_POS,MODE_HISTORY)==false)
           {
            Print("Error in history!");
            break;
           }
         if(OrderSymbol()!=Symbol() || OrderType()>OP_SELL)
            continue;
         //---
         if(OrderProfit()>0) break;
         if(OrderProfit()<0) losses++;
        }
      if(losses>1)
         lot=NormalizeDouble(lot-lot*losses/DecreaseFactor,1);
     }
//--- return lot size
   if(lot<0.02) lot=0.02;   
   return(lot);
  }
//+------------------------------------------------------------------+
//| Check for open order conditions                                  |
//+------------------------------------------------------------------+
void CheckForOpen()
  {
   double ma1;
   double ma2;
   double ma3;
   int    res;
//--- go trading only for first tiks of new bar
   if(Volume[0]>1) return;
//--- get Moving Average 
   ma1=iMA(NULL,0,MovingPeriod1,MovingShift,MODE_SMA,PRICE_CLOSE,0);  
   ma2=iMA(NULL,0,MovingPeriod2,MovingShift,MODE_SMA,PRICE_CLOSE,0);
   ma3=iMA(NULL,0,MovingPeriod3,MovingShift,MODE_SMA,PRICE_CLOSE,0);
//--- sell conditions
   if(Open[1]>Close[1] && Close[1]<ma1 && Close[1]<ma2 && Close[1]<ma3)   //空单开仓条件
     {
      res=OrderSend(Symbol(),OP_SELL,Lots,Bid,3,0,0,"",MAGICMA,0,Red);  
      return;
     }
//--- buy conditions
   if(Open[1]<Close[1] && Close[1]>ma1 && Close[1]>ma2 && Close[1]>ma3)   //多单开仓条件
     {
      res=OrderSend(Symbol(),OP_BUY,Lots,Ask,3,0,0,"",MAGICMA,0,Blue);
      return;
     }
//---
  }
  
//+------------------------------------------------------------------+
//| Check for open new order conditions                                  |
//+------------------------------------------------------------------+
void Open_New_Order()
  {
   double ma1;
   double ma2;
   double ma3;
   int    res1;
//--- go trading only for first tiks of new bar
   if(Volume[0]>1) return;
//--- get Moving Average 
   ma1=iMA(NULL,0,MovingPeriod1,MovingShift,MODE_SMA,PRICE_CLOSE,0);  
   ma2=iMA(NULL,0,MovingPeriod2,MovingShift,MODE_SMA,PRICE_CLOSE,0);
   ma3=iMA(NULL,0,MovingPeriod3,MovingShift,MODE_SMA,PRICE_CLOSE,0);
   if(OrdersTotal()>0)
   {
   if(OrdersTotal()<Order_Total && Open[1]<Close[1] && Close[1]>ma1 && Close[1]>ma2 && Close[1]>ma3)
     {
     res1=OrderSend(Symbol(),OP_BUY,iLots,Ask,0,0,0);
     }
   if(OrdersTotal()<Order_Total && Open[1]>Close[1] && Close[1]<ma1 && Close[1]<ma2 && Close[1]<ma3)
     {
     res1=OrderSend(Symbol(),OP_SELL,iLots,Bid,0,0,0);
     }
   }
   }

//+------------------------------------------------------------------+
//| Check for close order conditions                                 |
//+------------------------------------------------------------------+
void CheckForClose()
  {
   double ma1;
   double ma2;
   double ma3;
//--- go trading only for first tiks of new bar
   if(Volume[0]>1) return;
//--- get Moving Average 
   ma1=iMA(NULL,0,MovingPeriod1,MovingShift,MODE_SMA,PRICE_CLOSE,0);
   ma2=iMA(NULL,0,MovingPeriod2,MovingShift,MODE_SMA,PRICE_CLOSE,0);
   ma3=iMA(NULL,0,MovingPeriod3,MovingShift,MODE_SMA,PRICE_CLOSE,0);
//---
   for(int i=0;i<OrdersTotal();i++)
     {
      if(OrderSelect(i,SELECT_BY_POS,MODE_TRADES)==false) break;
      if(OrderMagicNumber()!=MAGICMA || OrderSymbol()!=Symbol()) continue;
      //--- check order type 
      if(OrderType()==OP_BUY)
        {
         if(Close[1]<ma1)
           {
            if(!OrderClose(OrderTicket(),OrderLots(),Bid,3,White))
               Print("OrderClose error ",GetLastError());
           }
         break;
        }
      if(OrderType()==OP_SELL)
        {
         if(Close[1]>ma1)
           {
            if(!OrderClose(OrderTicket(),OrderLots(),Ask,3,White))
               Print("OrderClose error ",GetLastError());
           }
         break;
        }
     }
//---
  }
//+------------------------------------------------------------------+
//| OnTick function                                                  |
//+------------------------------------------------------------------+
void OnTick()
  {
//--- check for history and trading
   if(Bars<100 || IsTradeAllowed()==false)
      return;
//--- calculate open orders by current symbol
   if(CalculateCurrentOrders(Symbol())==0) CheckForOpen();
   else                                    CheckForClose();
//---
  }
//+------------------------------------------------------------------+

 
手动做好了，EA不持久
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