BeatBuddy Manager SongPart requires 1 extra bar

I have written a song in BBM. It has an intro, 2 song parts, and an outro. For the song parts I created midi files of 4 bars each. When I synch and play the song through the BB the song parts are both only 3 bars long. If I make the song parts 5 bars long (in my midi creator) the BB song parts are 4 bars long!

Does anyone else have this issue - I can work around it (see above) but wondered if I am missing something.