How to calculate profit by history

Hi. This function is necessary, the expert Advisor increases the catch depending on the profit, but when a certain amount is reached, it resets the lot to the initial one and everything starts over again.

I did it like this:

for(int pr=OrdersHistoryTotal()-1;pr>=prstop;pr--)
   {
   if (profitclots < depo)  
     {
     profitclots += (OrderProfit()+OrderCommission()+OrderSwap());
     GetLots();
     }  
    
   if (profitclots > depo)
     {
     profitclots =0;
     GetLots();
     prstop = (OrdersHistoryTotal()-1);
     }
   }
Counts, resets, but! When the order type changes, the profit becomes negative. If the orders are all of the same type, then all are good. 

Tell me where to dig?