Whether you can close the deal is related to the way you place an order, including market trading and price limit trading. The market price is the best, but it is the most unfavorable for speculation, and the price has fallen quite sharply. Missing three points is normal.

It is not normal to withdraw the order without withdrawing it. If you don't close the deal in 5 seconds, you can withdraw the order at will, as long as it is displayed in the revocable column, you can withdraw the order.