Go to - Options-Preferences-Audio tab

There is an option to select which channel you want to record when using MONO.
You have selected "Left and Right" from the sounds of it. Choices are 'Left', 'Right', or 'Left and Right'
Change this to either left or right (whichever is applicable) and it should be fine. Otherwise RB (and PT) record both sides to their own mono track.


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