简单的顺势加仓策略问题

[Junbing Xie]

目标：手动指定起始价格、交易方向、加仓间隔后系统每达到一个加仓间隔自动加仓

 写到自动加仓的时候发现，只有第一第二笔交易按照加仓间隔进行加仓了，后面的均在第二笔交易价格之上不停买入，请高手看下代码错在哪里？

//+------------------------------------------------------------------+
//|                                                      shunshi.mq4 |
//|                                                           Jaguar |
//|                                                        FreeWorld |
//+------------------------------------------------------------------+
#property copyright "Jaguar"
#property link      "FreeWorld"
#property version   "1.00"
#property strict
//----------------UserInputParameter---------------------------------
extern   int      GridSpace=300;
extern   double   StartPrice=1.392;
extern   double   Lots=0.1;
extern   bool     BuyUp=true;
extern   bool     SellDown=false;
//----------------GlobalVariable--------------------------------------
double   LastBuyPrice=StartPrice;
double   LastSellPrice=StartPrice;
int      BuyCount=0;
int      SellCount=0;  
//+------------------------------------------------------------------+
//| Expert initialization function                                   |
//+------------------------------------------------------------------+
int init()
  {
//---

   
//---
   return(INIT_SUCCEEDED);
  }
//+------------------------------------------------------------------+
//| Expert deinitialization function                                 |
//+------------------------------------------------------------------+
int deinit(const int reason)
  {
//---
   return(0);
  }
//+------------------------------------------------------------------+
//| Expert tick function                                             |
//+------------------------------------------------------------------+
void start()
  {
  
//---BuyUP----------------------------------------------------------

   if(BuyUp)
   {
      if(Ask>(LastBuyPrice+Point*GridSpace))
      {

         if(OrderSend(Symbol(),OP_BUY,Lots,Ask,0,0,0,"BuyUp",9541,0,Red)==true)
         {
            LastBuyPrice+=Point*GridSpace;
            BuyCount+=1;
          
            
         }
      
      }
    }
      
      
//---SellDown
 /*  if(SellDown)
    {
      if(Bid<(LastBuyPrice-Point*GridSpace))
      {
         if(OrderSend(Symbol(),OP_SELL,Lots,Ask,3,0,0)==true)
         {
            LastSellPrice=Bid;
            SellCount+=1;
         }
      
      }
    }
   
   */ 
   
   }
 
  
//+------------------------------------------------------------------+