Lost Video Island

[Captain Freya]

So I've started a new video and I'm about halfway through so I decided to render a few chunks to see how it was looking. But when I watched them, the audio is completely out of sync with the clips. I've rendered it a couple of different times and i've tried slightly shifting the clips around on the timeline but it hasnt changed anything. Can anyone work out why it might be happening? Any help would be much appreciated cause I liked how this video was going and I don't wanna have to abandon it
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