Don't talk nonsense in the comments if you don't understand. When you bought it for 100u, it was worth 100u. Now that it has dropped, it's worth 50, and the remaining 50 is your unrealized profit.

This is my first time buying a contract. I bought 100U short, and it dropped by 80%, leaving my position with only 53U. Why do they keep reducing my position? Do they think I'm making money and want to refund my U? What if it drops 10 times and my position is only 10U, and then I end up earning nothing, with the funding fees already exceeding ten?