It could be that your BD player does not welcome mpeg2 footage with pulldown. In your case pulldown has been applied by AVStoDVD (thru DGPulldown) to change framerate from 24fps to 25fps.
Take a look to your player manual (or any related forum) to verify this guess.
If the guess is correct, as workaround you can go with the AssumeFPS approach. Add to the end of your project AviSynth script the following line:
Code:
AssumeFPS("pal_film", sync_audio=true).ResampleAudio(48000)
Bye