Sound starts early (set to stream)

I’m making a little animated movie. I have one chapter (one fla) where 3 guys talk. The firts 3 dialogues work perfectly in synk with the lips. But when the 3rd guys starts talking …

Its perfect when I preview in the timeline (pressing enter) but when I preview it as a movie, the sound for this particular character starts early. All the sounds are set to stream, and on diferent timelines. I searched and searched and found no awnser. Help anyone? thanks.