Audio out of sync

Ted Spencer

Veteran
All the audio in the footage I shot this weekend is out of sync by about 7 frames (earlier than the video). It was pefectly consistent throughout all the footage, so it was a very easy fix in FCP, but I've never encountered it before and am a bit surprised.

HVX200a, 720/30p, recording to 16 and 8GB cards. Audio was set to 29.97 nd. Both internal and external mics were out identically.

Any ideas as to why that happened?
 
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