Set track number from file name in MP3 music management software
You need to set the track number tags.
If you didn't mind software specifically to fix tags, you could probably use mp3tag to mass fix the track number tag in the file. Its a little tricky with no obvious deliminator between tracks, unless they are all called Track (tracknumber) however. You'd probably want to use the filename -> tag option, use "track%track%" to use the filename to populate track numbers
The autonumbering wizard option might prove helpful as well.