anyone else notice how the S3 skate.reel expands the frame of some of your clips???

its very annoying. look at these two clips i intended to place back to back with a sort of quick crossfade transition in my next solo (you know, the camera transitions from a sequence of my deck rolling up a slope to another sequence of my board rolling up a slope?)



well, you will notice that u can see at least part of my skater's body in both the clips. This is NOT the way i originally filmed and uploaded it. i had filmed both of these clips so that no part of my skater's body would be showing in the sequences of just the board rolling. (and i immediately uploaded them after i did this.) yet, for some reason, the skate.reel seems to have expanded the frame of my uploads. So...

-is there any way to PREVENT/FIX this?
-or has anyone else at least noticed this?
-is there anyway to adjust the frame dimensions of my clips in iMovie '09?

NOTE: i actually just edited the duration second clip so that it no longer shows part of the skaters body

responses plz...