I had the same thing happen to me. I am brand new to PTE V10. I found the audio clips from different songs kept moving down vertically and maybe this was because I had to add some additional tracks after I had made the show. If I had added all the songs at the beginning of creating the show, maybe this would not have happened. The only way I found to add the new songs after the show had been created was to add it as an audio comment. It sounds like I should have tried to drag it into the timeline.
