After reading other people's answers and your questions, I think the problem lies in your own ignorance of the futures settlement system. Futures is a daily debt-free settlement system that marks the market day by day. If you don't close the position, you will get a profit and loss of the settlement price, and then enter it into the general ledger. When you close your position the next day, you will calculate the profit and loss according to your closing price and yesterday's settlement price, and put it into your general ledger, so it seems that you lost a lot that day. In fact, if you look at yesterday's bill, there is no difference between the total profit and loss.

You opened your position at 1526, and closed your position at 1522 the next day. See for yourself what the settlement price was yesterday. Yesterday's bill was settled for you according to 1526 and yesterday's settlement price, and you earned a lot, which was included in your rights and interests yesterday; Today, you closed your position at 1522 and saw a loss of 6200. However, you calculated it yourself by combining the two-day bill: -6200+ yesterday's profit = the money you should actually earn?