Not sure what you're trying to show here, and may have missed some lines while viewing:
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At 0:01, "Withdrew order of Sealed Black Magic Crystal x976 for 5,856,000,000" = 6mil each, not 5.8. 6,000,000 * 976 = 5,856,000,000
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At 0:22, "Withdrew order of Sealed Black Magic Crystal x995 for 5,970,000,000" = 6mil each, not 5.8. 6,000,000 * 995 = 5,970,000,000
So am not sure where you're seeing your sale price change. If seeing it somewhere not shown in the video, please provide another video, as I'm not seeing any issues with the quantities or sale prices shown.