Severe slippage leads to liquidation of all hedged positions

All my positions have been hedged. In the morning, I saw that there was 4400-4500 US dollars left in my account, and the margin ratio was also higher than 100, but I was still able to liquidate the position. The most outrageous thing is that my GBPJPY was different in bid and ask price at the same time. The price difference is close to 1800 pips. MT4 account: 5101870 I hope someone can explain this to me.