Rush- if I record a voiceover it seems to automatically be linked to a video clip.

Hi, I’ve just started using Adobe rush on my iPhone. I make videos with lots of clips and I record voiceovers over the top. I tend to record my voiceover in sections. I’ve found that if I record a voiceover on an audio track, when I then move the video clips around, it completely messes up my voiceover, either moving or deleting sections of it. In turn, if I edit the voiceover it messes up the video clips. So it seems that when I record a voiceover it groups or links the voiceover clips with the video clips. How can I stop this without just locking the whole audio or video track?

Thanks