Order Executed Problem

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I install 8 EA for testing in different symbols. All the variable are different. But only one order is excute. Why.?
Files:
XAUUSDH-L.mq4  14 kb
  
  1. double XdayHigh = iHigh(NULL, PERIOD_D1, 0); // 0 = Current Day
double XdayLow = iLow(NULL, PERIOD_D1, 0);   // 0 = Current Day

    On MT4: Unless the current chart is that specific symbol(s)/TF(s) referenced, you must handle 4066/4073 errors before accessing candle/indicator values.
              Download history in MQL4 EA - MQL4 programming forum - Page 3 #26.4 (2019)

  2. Xticket = OrderSend(NULL,OP_SELL,XLotsize,Bid,10,XStopLossPrice,XTakeProfitPrice,NULL,XmagicNB,0,Red);

    Be careful with NULL.

    1. On MT4, you can use NULL in place of _Symbol only in those calls that the documentation specially says you can. iHigh does, iCustom does, MarketInfo does not, OrderSend does not.
    2. Don't use NULL (except for pointers where you explicitly check for it.) Use _Symbol and _Period, that is minimalist as possible and more efficient.
    3. Zero is the same as PERIOD_CURRENT which means _Period. Don't hard code numbers.
    4. MT4: No need for a function call with iHigh(NULL,0,s) just use the predefined arrays, i.e. High[].
      MT5: create them.
    5. Cloud Protector Bug? - MQL4 programming forum (2020) 

  3.                      double XStopLossPrice = XdayHigh;

    You buy at the Ask and sell at the Bid. Pending Buy Stop orders become market orders when hit by the Ask.

    1. Your buy order's TP/SL (or Sell Stop's/Sell Limit's entry) are triggered when the Bid / OrderClosePrice reaches it. Using Ask±n, makes your SL shorter and your TP longer, by the spread. Don't you want the specified amount used in either direction?

    2. Your sell order's TP/SL (or Buy Stop's/Buy Limit's entry) will be triggered when the Ask / OrderClosePrice reaches it. To trigger close at a specific Bid price, add the average spread.
                MODE_SPREAD (Paul) - MQL4 programming forum - Page 3 #25

    3. Prices (open, SL, and TP) must be a multiple of ticksize. Using Point means code breaks on 4 digit brokers (if any still exists), exotics (e.g. USDZAR where spread is over 500 points), and metals. Compute what a logical PIP is and use that, not points.
                How to manage JPY pairs with parameters? - MQL4 programming forum (2017)
                Slippage defined in index points - Expert Advisors and Automated Trading - MQL5 programming forum (2018)

    4. The charts show Bid prices only. Turn on the Ask line to see how big the spread is (Tools → Options (control+O) → charts → Show ask line.)

      Most brokers with variable spreads widen considerably at end of day (5 PM ET) ± 30 minutes.
      My GBPJPY shows average spread = 26 points, average maximum spread = 134.
      My EURCHF shows average spread = 18 points, average maximum spread = 106.
      (your broker will be similar).
                Is it reasonable to have such a huge spreads (20 PIP spreads) in EURCHF? - General - MQL5 programming forum (2022)

  4. double GetPipValue()
  {
   if(_Digits >=5)
     {
      return 0.00001;
     }
   else
     {
      return 0.01;
     }
  }

    First, Those are not PIP values, those are PIP sizes. Second, 0.00001 is a point not a PIP. 0.01 is a PIP on JPY pairs.

    PIP, Point, or Tick size are all different in general.
              Ticks, PIPs or points in the GUI. Make up your mind. - MQL4 programming forum #1 (2014)
              Percentage in point - Wikipedia

    Unless you manually adjust your SL/TP for each separate symbol, using Point means code breaks on 4 digit brokers (if any still exists), exotics (e.g. USDZAR where spread is over 500 points), and metals. Compute what a logical PIP is and use that, not points.
              How to manage JPY pairs with parameters? - MQL4 programming forum (2017)
              Slippage defined in index points - Expert Advisors and Automated Trading - MQL5 programming forum (2018)

  5.      if (CurrentTime >= StartTradingTime && CurrentTime <= StopTradingTime)
    1. Doesn't stop on the first minute of stop time.
    2. Fails if start is greater than stop. I.e. start=2300, stop=0100
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