Exported AIFF file out of sync

I have a 1080i HDTV sequence in FCP 6.0.6, 48KHz 16 bit audio. Video clips are from a Canon 5DMk II transcoded to ProRes HQ via Streamclip. I was going to do a little audio cleanup using Bias Peak, so I exported an AIFF file of the completed sequence from FCP. Something is goofing up the exported file's rate as it is now running slightly longer than the original. As a test, I exported the audio from 1 clip and immediately imported it back into FCP, placing the test audio in the sequence under the original audio, then listened to the mix. As soon you hit play, you can hear the audio going out of phase with itself. Checking the sequence properties, I have 30fps/48Khz/32 bit floating point. Video Clip properties 30fps/48Khz/16 bit integer. Audio clip properties 48Khz/16 bit integer. AIFF created by: File>Export>Audio to AIFF{s}. What do you think?

Ran the clips through MPEG Streamclip again at 29.97fps and created a new Project with matching Sequence Settings. Exported AIFF matches original audio perfectly. We are now A-OK.

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Exported AIFF file out of sync

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