It's very simple, you get your actual selling price by dividing the amount you received from your sale by the quantity of BR. Today, during that time period, the price of BR increased, so the actual selling price went up, and I also made some gains. Another reason is that your buying price has decreased. Excluding slippage, the amount of BR you receive has increased. If you don't manually input the quantity every time you sell at a limit price, it's hard to notice this point.