Duplication of a buying order

Hello everyone,

I'm currently learning the MQL4 language by means of this helpful forum and typically, I often succeed to find the right information (on the forum or the mql4 book). But now, i'm definitely stuck on a weird situation.

I'm currently coding a trend following strategy, which consists in taking supposed ends of corrections in the direction of the main trend. I started to code the "selling part" of the EA and works fine. Then I started adding the buying one and this is where the trouble starts.

The EA is supposed to check if there already is a opened position, and depending on if this is the case or not, open a second order with a specific risk. Here is the selling part which triggers the ordersend execution:

//Vérification du setup de fin de correction haussière sur une tendance baissière
   if(bBiaisHaussierDaily==false && bTradeAutorise==true && bCorrectionHaussiereM30==true && iClose(Symbol(),PERIOD_M30,1)<iLow(Symbol(),PERIOD_M30,iLowest(Symbol(),PERIOD_M30,MODE_LOW,iCanalPeriode,2)))
      {
      RefreshRates();
      if(dDernierPrixM30==0)
         {
         while(IsTradeContextBusy() == True)
            Sleep(1000);
         iTicket=OrderSend(Symbol(),OP_SELL,fCalculTaillePositionM30(),Bid,fValeurSlippage(Symbol(),5),dNiveauHautH4,0,NULL,123,0,Red);
         fErreur();
         }
      if(Bid<dDernierPrixM30-(2*iATR(Symbol(),PERIOD_M30,iCanalPeriode,1)))
         {
         while(IsTradeContextBusy() == True)
            Sleep(1000);
         iTicket=OrderSend(Symbol(),OP_SELL,fCalculTaillePositionSupM30(),Bid,fValeurSlippage(Symbol(),5),dNiveauHautH4,0,NULL,123,0,Red);
         fErreur();
         }
      bCorrectionHaussiereM30=false;
      }

If dDernierPrixM30==0, that means that there is no opened position.

If dDernierPrixM30 !=0, that means that there already is an opened one and the EA has to check if the current Ask is far away from the last entry to trigger a new order or not.

This part of code is working.

Now here is the "buying part" of the code:

//Vérification du setup de fin de correction baissière sur une tendance haussière
   if(bBiaisHaussierDaily==true && bTradeAutorise==true && bCorrectionBaissiereM30==true && iClose(Symbol(),PERIOD_M30,1)>iHigh(Symbol(),PERIOD_M30,iHighest(Symbol(),PERIOD_M30,MODE_HIGH,iCanalPeriode,2)))
      {
      RefreshRates();
      if(dDernierPrixM30==0)
         {
         while(IsTradeContextBusy() == True)
            Sleep(1000);
         iTicket=OrderSend(Symbol(),OP_BUY,fCalculTaillePositionM30(),Ask,fValeurSlippage(Symbol(),5),dNiveauBasH4,0,NULL,123,0,Green);
         fErreur();
         }
      if(Ask>dDernierPrixM30+(2*iATR(Symbol(),PERIOD_M30,iCanalPeriode,1)))
         {
         while(IsTradeContextBusy() == True)
            Sleep(1000);
         iTicket=OrderSend(Symbol(),OP_BUY,fCalculTaillePositionSupM30(),Ask,fValeurSlippage(Symbol(),5),dNiveauBasH4,0,NULL,123,0,Green);
         fErreur();
         }
      bCorrectionBaissiereM30=false;
      }

The principle is the same, but this time, if the variable "dDernierPrixM30" ==0, the first position is systematically duplicated twice. In vain, I have no idea about was could be wrong in the code.

This is the first time that I post here, and I don't really know if the above code is sufficient to understand something about it. Please let me know if you need additional information. Thanks in advance for your help.