No Audio on Later Chapters

[cannew]

Burned disk with Shrink and no problems or errors, however, on some of the later chapters there was no audio. I seleced the 5.1 Audio first.

Then I re-burned and selected both 2 & 5.1 Audio. This time the audio was fine.

Should it matter which audio is selected. I thought 5.1 would be the best to select when possible.