iMovie not playing still frames in video

Hi, I'm currently making a highlight tape for football to send to colleges when I came across a problem. I have still frames that I print screened from the video that I need to put into the film. When I import the clips, they work as if they should, but when I hit play movie the clips are skipped altogether and the previous clips play extra time. I tried doing this in iMovie HD and iMovie 09.. Any ideas why this is happening?

 

Not familiar with imovie....but does it give you like a storyboard......if so can you stretch the still frames......or just place more of the same frame in a row.

 

It has a storyboard, but when I put it in place, no matter for what time frame it overrides it and ignores it completely.