Available funds are less than 0. The futures brokerage company has the right to balance part or all of it for you. In some cases, there will be no strong leveling, but a strong leveling notice will be issued. Risk controllers (super traders) also look at the market and see if it is necessary to be stronger according to the market. If your position is in the right direction, they will not be strong even if there are fluctuations. If the fluctuation is violent, and the direction you choose is opposite to the position of the futures company where you open an account, then the super trader will be forced to draw a few hands according to your capital ratio.