I noticed for some song packs (20% ?), the playlists are in reverse order, as well as the numbering which goes downwards from 99.
http://vgmrips.net/packs/pack/finalfantasyhttp://vgmrips.net/packs/pack/sonyc-fmhttp://vgmrips.net/packs/pack/sonyc-mshttp://vgmrips.net/packs/pack/disc-station-fmhttp://vgmrips.net/packs/pack/columns-msx-fmhttp://vgmrips.net/packs/pack/namco-disk-magazinehttp://vgmrips.net/packs/pack/kirby-s-dream-landEtc. I tested in Firefox and Chrome.
Also while I’m on the topic, when I select another song to play, the previous one keeps downloading (also the loading progress meter goes a bit haywire). After a number of them, I’m better off refreshing the browser page because loading the next one starts taking a long time.