I have had this trouble in the past also. Recently, for months, I have been playing mp3 books I purchased on CD which came with sequential track numbers by chapter. This latest 4 CD set reminded me of the previous issue, that I did not resolve.
My track #s do not have the leading zeros. Some have played on a car CD/mp3 player in file name sequence, but needed the leading zeros also. I have never used CD #s.
Lately I use the advanced properties of Windows Explorer to edit the ID3 tags, and the CD # does not show up under any of it’s editable fields.
