Imported Audio Speed Changed

I have an iPhone video imported into iMovie (10.0.7).  I also open this same video file into QuickTime (10.4) and Export the Audio Only into a m4a file.
When I import this audio file into iMovie and line it up at the start of the movie, I find that after four minutes, the imported audio is slow by about ¼ second.  I know how to fix this... but WHY is this happening (and shouldn't it be fixed)?
I have an old Cisco FlipVideo camera and used it to film the same thing that I filmed with my iPhone.  Those two sources are lined up perfectly after the 4 minutes.  Why should imported audio that started at the same source be any less accurate?
Thanks for your thoughts!
     Barry

http://www.bulletsandbones.com/GB/GBFAQ.html#toofast

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