The above behavior is called (lock order) in futures trading.
The essence of futures is to sign long-term contracts with others to buy and sell goods (or stock indexes, foreign exchange, interest rates) in order to achieve the purpose of maintaining value or making money.
If you think the futures price will go up, go long (buy and open positions), go up (sell) and close positions, and earn: price difference = close positions-open positions.
If you think the futures price will fall, short (sell the position), fall (buy) and close the position, and earn: price difference = opening price-closing price.
Opening a position is to sign a sales contract with others (you need to pay an opening deposit); Closing a position is to terminate the sales contract (make a cash settlement and get your deposit back); A lock order is equivalent to signing two sales contracts at the same time. The effect is equivalent to not holding a position (closing the position), but taking up two deposits for buying and selling, and paying two more handling fees for buying and selling when closing the position again. Therefore, lock orders are not a good trading method in futures trading.