Abnormal trading time and operation mode

I traded gold and forex in MIA,docking Fengdi plus broke..According to the contract,0.6 lot each time,the take-profit and stop-loss price didn’t exceed 4 pips.Last night,I didn’t stop loss for 2 orders since the original lot increased by more than 20 times, thus my account became negative because of forced liquidation.The broker and MIA kept shirking the responsibility.The is the first time I encountered with abnormal trading time and operation mode.