Glitches

Its okay other than the fact that it messes up the audio I put in and moves it all around and also doesnt make transitions between video clips. The sound effects or music I put in the background get moved a few seconds before or after from where I originally put it. It also always goes black right before the clips change. Ive been working for the past few hours on a video that is literally 2 min and 45 sec because this app keeps screwing everything up and I have to fix it.

YO  about iMovie, v2.1.2