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I encountered a problem in the alpha section trading that I can't figure out. Is there anyone who can explain it to me?

I bought 58u in the alpha section at 6:10 (Image 1) and the candlestick chart at that time is shown in Image 3. Later, at 6:45, I saw the candlestick chart had reached a higher position, so I wanted to sell (Image 2) to complete this day's score-boosting trade. However, the amount of u I received was even less than what I bought at the low point? Why is that?