Why-my-strategy-won-t-take-trades-in-certain-stock

CODE:

using WealthLab.Backtest;
using System;
using WealthLab.Core;
using WealthLab.Indicators;
using System.Drawing;
using System.Collections.Generic;

namespace WealthScript1 
{   
   public class A28_strategy : UserStrategyBase
   {
      List<BarHistory> Buys = new List<BarHistory>();
      TimeSeries _Ts_SMA;
      BarHistory Treasury_Index;
      double _TE_val;
      
      public A28_strategy()
      {
         AddParameter(" Window ", ParameterTypes.Int32, 5, 5, 60, 1);
      }

      public override void Initialize(BarHistory bars)
      {
         StartIndex = Parameters[0].AsInt;

         _Ts_SMA = SMA.Series(bars.Close, 10);

         bars.Cache["Data"] = _Ts_SMA;

         PlotTimeSeries(_Ts_SMA, "SMA", "Pane");
      }

        public override void PreExecute(DateTime dt, List<BarHistory> participants)
        {   
         if (participants.Count != 2) return;
         
         foreach (BarHistory bh in participants)
         {
            TimeSeries _TE = (TimeSeries)bh.Cache["Data"];
            int idx = GetCurrentIndex(bh);
            _TE_val = _TE[idx];
            bh.UserData = _TE_val;
         }
         participants.Sort((a, b) => -a.UserDataAsDouble.CompareTo(b.UserDataAsDouble));

         Buys.Clear();
         for (int n = 0; n < 1; n++)
         {
            if (n >= participants.Count)
               break;
            WriteToDebugLog(" DATE = " + dt.ToString("yyyy/MM/dd") + " ADD SYMBOL = " + participants[n].Symbol);
            Buys.Add(participants[n]);
         }
        }

        public override void Execute(BarHistory bars, int idx)
      {
         bool _BuyList = Buys.Contains(bars);

         if (_BuyList)
         {
            WriteToDebugLog(" BUY LIST SYMBOL = " + bars.Symbol);
            if (!HasOpenPosition(bars, PositionType.Long))
               PlaceTrade(bars, TransactionType.Buy, OrderType.Market);
         }
         else if (!_BuyList)
         {
            if (HasOpenPosition(bars, PositionType.Long))
               ClosePosition(LastPosition, OrderType.Market);
         }
      }
   }
}