Could you advise what track your melody is on in your studio PC? Presumably it is the same track.

Is there any chance that you might have inadvertently generated a Solo onto that track:

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BIAB & RB2025 Win.(Audiophile), Sonar Platinum, Cakewalk by Bandlab, Izotope Prod.Bundle, Roland RD-1000, Synthogy Ivory, Kontakt, Focusrite 18i20, KetronSD2, NS40M Monitors, Pioneer Active Monitors, AKG K271 Studio H'phones