What file format are you exporting to?
Does the frame rate of the source footage match the frame rate of the Sequence and does that match the frame rate of the exported file?
Everything was shot at 23.976, so the entire sequence & export settings are also at 23.976.
EDIT: We are exporting an H.264 then running through AME to produce a QT
Can you upload the file to say Youtube to watch and a screenshot of the timeline and export settings?
Still having this trouble? Let us know.