weird garageband skip/hiccup

in Genius Bar edited January 2014
First I recorded a drum track (live drum set with macbook built-in microphone)

Second I chose one good measure, chopped it out, drug it into a new basic track, and looped it about fifty times.

That became my drum beat, and I started to lay down tracks.

Once I got to my 10th or so track, a vocal track, all of a sudden when i played the song back, around the 14th measure, the drum loop I built everything on has like this weird little skip, like a little rush. Every other track seems to play fine, but just that one drum loop track in that one spot has like this little hiccup!

Anybody know anything about this? I been using GB for about 5 years and this is the first time I ever expierienced anything like this, right now I'm running leopard 10.5.5 on the new unibody macbook, 2.4 GHz, 2 gig ram... thanks!
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