Track Number

I was first using Songbird to update the tags in my MP3 files. The track numbers were already there but added the total track fields (the tag name was total tracks but for tracks was ?? / ?? same as for discs). Now in MP3Tag the track numbers all show up as /?? with the ?? being the total tracks on the album.

Does anyone know why?

It seems to be a bug in Songbird, it writes only /y or x/ in the tag instead of x/y

Thanks, however in other applications it shows both the track and total tracks.