When using CloneBD , getting to the "Selection" screen, some movies have 2 to 4 "Main Features" listed. The description boxes for all read the same. CloneBD doesn't always pick the "Main Feature #1". The run times between the "Main Features" can be slightly different 3 - 6 sec. Why are there multiple copies of the movie on the disk? How does CloneBD know which to pick?