The so-called short position generally refers to the short position when your maintenance margin level does not reach a certain level of funds. To put it bluntly, when the amount of funds in your futures account does not reach the level required to maintain your position, it will be regarded as a short position. Because futures enter and exit at the settlement price of the day every day, if your funds can't reach a maintenance margin level and there is no other funds to make up for it, there will be short positions.