How to fix: audio out of sync

I converted a Keynote presentation to Quicktime. On one slide, there is a video clip (quicktime file). The video clip runs fine on it own and when inserted into the slide show in Keynote. The problem is after I convert the whole thing to Quicktime. The movie plays fine, except the sound on the embedded QT video clip is now out of sync. Does anyone know why this is happening and how to fix?

Here's what I've tried:

- Deleting the the QT video clip from the Keynote presentation and reinserting it, the converting the whole presentation to Quicktime again. The video clip's audio is still out of sync.

- Created a new video clip in iMovie, exported as QT file. And reinserted it into the Keynote presentation, then again converted to QT, but video clip's audio remains out of sync.

Does anyone know how to fix this?

Thanks

Keynote 6.2.2

QT 10.3

Max OS 10.9.5