Neilsen originally reported the 18,000 number, but Strange later supplied evidence to HipHopDX that Neilsen had corrected an error in their counting which brought the number to 21,000. This is evident by the fact that Sickology 101 charted 19th on the Billboard 200, because the 18,000 number would have put him at 23rd, while the number H.D.D. reported (24,000, no clue where they got that number) would have put him in the neighborhood of 11th, hence, they were off.