Super slippage. At that time, I bought a long order of bitcoin of 1 lot for 3000 dollars. The trend was downward and it suddenly plummet for 12000 pips in one second and comes back very quick. It makes my position wipe out. I lost my my 7000 dollars principle and also got a minus 18000 dollars. The slippage situation is shown in the figure, super long plummet.