MP3 playing order

[BitStream]

I've ripped some CD's using Audiograbber and burned them into folders using Nero.

One album for instance looks like this:

Gotan Project - 01 - Triptico.mp3
Zeb - 02 - Sulism.mp3
Osman Ismen - 03 - Kale.mp3
Freeman - 04 - My Dear Masters.mp3
Ekova - 05 - Starlight In Daden.mp3
Talvin Singh - 06 - Veena.mp3
Ravi Prasad - 07 - Indian Gipsy.mp3
Hasan Cihat Orter - 08 - Flirting Shadows.mp3
Anna Vissy - 09 - Den Me Agapas.mp3
Nacho Sotomayor - 10 - Don't Do Anything.mp3
Badmarsh & Shri - 11 - Sitar Ritual.mp3
Kodo - 12 - Strobe's Nanafushi.mp3
Livin' In Da Ghetto - 13 - Arabian Song.mp3

When my car player plays the tracks it does not play them in order i.e. Track 1 then 2 etc. Am I doing something wrong?