Where you building your disk in Encore? If yes then this is a bug and needs to be reported.
I had this problem to. the cause of this is due to not completly imported audio by Encore. which means you have to wait for Encore to confirm all audio
and then burn your disk. You can see the progress when you click on asset in project panel and turn on the progress panel, cause it may not be on by default.
The only way to fix this is to rebuild your project and wait for complete confirmation of your audio.
Thank you so much. I did have problems with Encore, but I hopefully got that resolved. This specific problem is audio out of sync in my media encoder. I can't test the project beforehand. It took 2 1/2 hours to encode and when I played the finished project, it was out of sync.
I have not seen a media encoder getting audio out of sync.