It looks like the Amazon derankings have been, um, un-deranked :)
Funniest amazonfail twitter: "Kroger grocery overrides produce manager's removal of phallic fruits & vegetables from shelves. Blames automated scanner glitch." (roncharles)
Some books are still deranked--is yours? You can add it to the list here.
A good summary here: Authors, readers angry over Amazon 'glitch'