Quote from Rehoboth:
No risk for the broker. But so what? What is the liquidation policy? At that moment, your account was theo neg, so you got liquidated.
Seriously I dont understand why you are so confused. You are right there is no risk to the broker by letting you hold your position no matter the market conditions. But its clear your broker has a liquidation policy that is based on market conditions. So I am sorry to say, that this is on you. You have to know that this is a risk.
If this was IB, you could have called them and got a no liquidation status on your postion.