Never used Kucoin for futures trading because of a KYC issue, but I think their support can help identify what the problem is. The last time I used their live support chat, it was swift, and they helped me out.
I did not provide any KYC for derivative trading on Kucoin, only email, password and trading password was all that were required.
Have to checked to see if the whole order was filled?
Yes, it was all filled. But I will try that again when I transfer money to the exchange to see if it is due to what you said, but I doubt that.
Their tutorial doesn't really make it clear either, but I don't think that's supposed to happen. If you take a look at
https://www.kucoin.com/futures/refer/baseBTCPosition, the position opened with a slightly lower fund so there might be some fees at play, but I doubt it would
I do check all these but I think it is not the case. I will use Kucoin to open another position once I fund my account on the exchange, to make things clearer. What I do not remember is if I did not use 100% fund, I do change it to 95% when using market order for it not to bring error on exchanges like OKX, (but I do repeatedly do that until the money used is 99.99%). Maybe I did it like that on Kucoin too, but I doubt that I did something like that that I did not use up to 99 to 100%. I have closed the position long time ago, so I could not check again, but before I can come up with this, I think I checked the total amount of money used and the leverage it opened.