Why would this work perfectly in strategy tester, but absolutely makes no sense in live?

[lljustll]

So this code opens up a trade based on risk I set on EA options. Say I set the acc size to 1000 and risk to 1. That means the EA will risk 100$. SL should be at -100$. and TP is 1:1 so at +100$- lot size.will be calculated automatically. It works perfectly in Strategy tester. But on live the SL would be at like -2$ and completely wrong Lot size and TP is far away but still +100$. So anyone knows why is this happening.

void openBuy(double openPrice, double stoploss, double takeprofit)
{
   openTrade(1, openPrice, stoploss, takeprofit);
}

void openSell(double openPrice, double stoploss, double takeprofit)
{
   openTrade(0, openPrice, stoploss, takeprofit);
}

void openTrade(int type, double openPrice, double stoploss, double takeprofit)
{
   double tickSize = MarketInfo(Symbol(), MODE_TICKSIZE);
   double tickCount = MathAbs(openPrice-stoploss)/tickSize;
   double tickValue = MarketInfo(Symbol(), MODE_TICKVALUE);
   double valueToRisk = acc_size * risk_perc / 100;
   double positionSize = (tickCount * tickValue) != 0 ? valueToRisk/(tickCount * tickValue) : 0;
   Print(positionSize);
   positionSize = NormalizeDouble(positionSize, 2);
   if(positionSize == 0)
   {
      Print("error while calculating lot size");
      Print(openPrice);
      Print(stoploss);
      Print(tickCount);
      Print(tickValue);
      Print(tickSize);
      Print(valueToRisk);
      Print(tickCount * tickValue);
      Print(MathAbs(openPrice - stoploss)/_Point/10);
   }
   else
   {
      if(type == 1)
      {
         if(!OrderSend(Symbol(), OP_BUY, positionSize, openPrice,50, stoploss, takeprofit))
         {
            Print(GetLastError());
         }
      }
      else
      {
         if(!OrderSend(Symbol(), OP_SELL, positionSize, openPrice, 50, stoploss, takeprofit))
         {
            Print(GetLastError());
         }
      }
   }
}