Fixing Sync clips

Hey. I've shot a live band with several angles. The idea is to sync them all to the audio track, creating synced clips and then putting them into a multicam clip for editing. That's all fine - i love this workflow - however, some of the clips are ever so slightly out of sync (we're talking just a few frames out, but thats enough to make it look bad). I read somewhere that to fix sync issues you can right-click the synced clip > open in timeline > and then nudge the video/audio left or right by using the '.' and ',' keys. However when i do that it moves both clips (the audio and the video) instead of just nudging just the video independantly - they appear to be attached to eachother. Can anyone help with this? Thanks for reading

NB. in the screenshot you can see the video is higlighted yellow, when i tap '.' to nudge it right, the green audio track moves too. aaarrggh. i'm sure it must be a simple thing.

There is a simple trick, but the normal procedure is to shift the audio and not the video. Jus put a gap clip in front of the video if you need to shift the audio to the left.