iMovie Audio Export Problems

Hi,

I've just created my first video on iMovie, and when I export the file to a folder on my hard drive, and then watch the video, there's two areas where there is an overlap of a voice from a clip that was deleted a long time ago. There is no evidence of this voice being present in iMovie when watching the clip, or in any of the audio tracks listed. I don't know where it's coming from and how to delete it. I've deleted the clip and re added it in, and that has not worked.

I'm a beginner user in iMovie so I haven't the faintest clue how to fix it, or why this has happened.

Please help!