code error in calculations ??

hopefully someone could help me ... 

this Algop is supposed to close all trades anddelete all orders 

once the target is reached.

but it was serval times the bot did close trades WAY too early .. with no appearent reason.

the function is startet OnTick

        private void closeWhenTarget(double target)
        {
            double profit = target;

            foreach (Position p in Positions)
                profit += p.NetProfit;

            // when profit is negative, we're done
            if (profit < target)
                return;

            // target is reached 
            foreach (Position p in Positions)
                ClosePosition(p);

            //  close all pending orders
            foreach (PendingOrder o in PendingOrders)
                CancelPendingOrder(o);


            // go sleep
            Stop();
        }