I kept holding crude oil before 20th since the price on ACY Securities was similar with other platforms. On the morning of 21st, only the price on ACY Securities plummeted to the bottom, with $2 differing from other platform. But ACY Securities claimed that the basis of weighted calculation led to the price difference. Why there was a $2 price difference on 21st? It must has no line with the spread or slippage. In the afternoon of the day, the price suddenly recovered to $6 from $8. How did ACY Securities calculate the price? The customer service explained that every bank’s structure of price. But can you explain why the price leaped from $8 to $6 within a day? It may use the price to make clients’ accounts liquidated, enabling them to buy short to recover the loss. However, it couldn’t give us an explanation. Clients have the right to cut or close their position. But the abnormal price will make it impossible to blame the responsibility.