Missing Audio

New to the DVD backup scene.

Have used DVDDecrypter and then Nero Recode to get a DVD-9 onto DVD-R.

The whole thing works fine on my computer DVD-ROM but when played on Living Room DVD player, I get Audio for the Main Menu and first Sub menu and NOT for the episodes themselves.

Living Room player is a Sony DVP-NS305

Can anyone help me with where I may have gone wrong ?

Thanks,
Zak.