[amibroker] Just tried my first simple medium level custom backtest and I have a quick question.

[Potato Soup]

So I took the template code for a backtest from the user knowledge base 
article. What I don't understand is why it changes the outcome of my trades 
even though I have no custom code in it. For instance, before inserting the 
custom backtest code, my AFL creates 30 trades. But with this added, it creates 
34 trades, and 2 of them are on the same day.

Why would this following code modify the outcome of an AFL backtest:

SetCustomBacktestProc("");
if (Status("action") == actionPortfolio)
{
    //  Get backtester object
   bo = GetBacktesterObject();    

    // o pre-processing
    bo.PreProcess();
       
    // Loop through all bars
    for (i = 0; i < BarCount; i++)    
   {

        // Loop through all signals at this bar
       for (sig = bo.GetFirstSignal(i); sig; sig = bo.GetNextSignal(i))
       {    
            // Process trades at this bar
            bo.ProcessTradeSignals(i);    
       }    

        // Handle programmed stops at this bar
       bo.HandleStops(i);    

        // Update MAE/MFE stats for bar
       bo.UpdateStats(i, 1);    

        // Update stats at bar's end
       bo.UpdateStats(i, 2);    
   }    

    // Do post-processing
   bo.PostProcess();    
}
///// End of custom backtesting code