When you open a short position, the price of the coin is 6.15. You open a position of 200u, 200/6.15=32.520325. When you take a screenshot, the marked price is 1.14, 1.14*32.5=37.05U, which is the position value of 37u. The price of the coin has dropped, so the position value will definitely decrease. If you switch to the number of coins held, it will not change.