PSF futures surged on Nov 24 and the sales of direct-spun PSF improved much with sales ratio

PSF futures surged on Nov 24 and the sales of direct-spun PSF improved much with sales ratio averaging over 500%. On the next day, direct-spun PSF price moved up, but the sales ratio still reached 110%. Why is it sold better when the price moves up, different from PFY’s better sales when price is lo