2600 long. How could I lose 8000? I also don't quite understand.

Which teacher can explain that with a position opened at 6.3, a margin of 260u, and a current price of 1.546, why would there be a loss of over 8,000U? The margin is just over 200, I don't understand how it's calculated. Isn't it supposed to close when the 263u is lost? How can there be a loss of over 8,000? $BNB
{spot}(BNBUSDT)