So is it my mistake? Actually it is first time when I had to ask from support. Usually I make every day about 10-30 trades in coinexchange and never seen anything like that in there, always got exact amount or paid exact amount what is shown before.
I just thought that I have to pay 0.309757599923 BTC (+0.20%) for 3097575.99923 XP, not 0.32297969 BTC. And I thought that I will get 0.218708447634 BTC (-0.20%) for 2187084.47634 XP, not 0.21232187 BTC.
But if it is as it has to be then let it be. I thought that maybe it is some mistake.
Gosh....now I completely understand why centralized exchanges support is the way it is

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it just doesn't make sense that you buy and sell coin for the same price on the same day. That's like buying a stock and paying the associated fees plus broker fee then turn around and sell the stock few minutes later for the same price you bought it and pay associated fees for selling plus broker fee that facilitated the sale. it makes absolutely no sense.