Export out of sync, plays fine in FCP

I'm working on a short movie for a class I'm in, and everything shows up and plays fine when open the file in Final Cut, but for some reason, it doesn't want to export properly. Whenever I export, no matter what settings I've chosen, the audio and video become out of sync in the exported file, but strangely only for clips where we've chosen a different audio track from the original recording. The first clip, which uses the audio and video from the camera, works fine when exported, but for each subsequent clip, the audio starts close to synced, then gets further and further out of sync. Even more baffling, the final clip, which is done the same as all the others, with video playing and an external audio track synced to it, works fine again!
I'm pretty sure that the problem is with the video, as it seems to slow or have parts cut out of it in the rendered file.
Anybody have any ideas what could knock the video out of sync like that when rendering?

I'm working on a short movie for a class I'm in, and everything shows up and plays fine when open the file in Final Cut, but for some reason, it doesn't want to export properly. Whenever I export, no matter what settings I've chosen, the audio and video become out of sync in the exported file, but strangely only for clips where we've chosen a different audio track from the original recording. The first clip, which uses the audio and video from the camera, works fine when exported, but for each subsequent clip, the audio starts close to synced, then gets further and further out of sync. Even more baffling, the final clip, which is done the same as all the others, with video playing and an external audio track synced to it, works fine again!
I'm pretty sure that the problem is with the video, as it seems to slow or have parts cut out of it in the rendered file.
Anybody have any ideas what could knock the video out of sync like that when rendering?

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