I cannot believe this.
Clicked on wrong the button. Suppose to short and I clicked on buy button. Second short was too late.
Realised scalp blunder:  - 1599 USD
That figure could have been my gain instead of loss. Second time made this kind of mistake on moomoo app. moomoo should separate the buy and sell button further apart in the app.
Post note update:
Managed to reduce the day realised loss to half. Small change. Very easy fore to...