Hang Seng Index’s spread raised up to 1,300 pips in one second

On October 5, 2018, I used YaMa's trading software to short two Hang Seng Index orders, one lot each. After one second when I made the second order, the system automatically forced the order to close out, which caused 10,000 dollars in the account were deducted. Later, I checked the transaction and found that the system automatically closed the position. The price of the shorts was 26493, 26401 and the automatic transaction price was 27766. the index price was increased by more than 1300 pips in one second. However, in the trading software, the daily k line did not have this price. The highest price was 266051, while the lowest price was 26313.