Beat is playing in left monitor, while melodies are being played in right monitor in cubase 13. How to fix that, so that both beat as well as melody will play from each monitor.
Pan them both to middle?
Assign the track outs correctly?
Tell us what the beats and melody are being played by if one or both are instruments?
Or if they are audio are they stereo files or mono files?
Screencap might answer most of what we need to know.
Sounds like you have assigned something odd in connections.