I don't know how it is on the unique exchange but I have used the Binance exchange and I have seen something like that there.
Maybe you are misinterpreting it to the hedge mode in which you can open the opposite position. What I explained is not on Binance and all the derivative exchanges that I have used before.
Thatnk you all for your answers.
I will lock the thread now. If you have good information that you want to post, you can send me PM to open the thread.