HDD actually has the higher range for her "total" including singles that were sold before the album release along with the album by itself (I guess this includes sales and streams of the pre-release singles and the album). The 600 to 675 is for the album strictly (again, I guess that includes sales and streaming of the album). I've never seen it reported this way before but I guess it's an attempt to inflate her numbers (by throwing in the number of singles sold and streamed before the album was released.) In other words, they are not reporting the pure sales range, only: the album sales and streams PLUS presale singles VS. the album sales and streams WITHOUT presale singles.