At 20:30 on September 4, 2026, I placed a long order at 4455.57. When I saw a profit, I activated a trailing stop. Finally, the stop loss was triggered at 4471.57. It should have been profitable, but in reality I still lost more than 2000. Yet the platform backend showed it was in profit. The next day, the platform modified the backend data again. This slippage is severe. If the stop loss is useless, what's the point of setting it? The platform's customer service was also perfunctory.