I don't fully understand what you are meaning.
When you say "when using a random track to check everything is working, it records fine", what do you mean by "a random track".Could you please tell me which number is your "random track"? (Mixer tracks are numbered from the top down. This means that the Bass track is #1, the Audio track is #9, the Thru track is #8, etc.)
Also, when you say, "when I switch to the track I'm actually working on", what track number is that one?
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