I've seen Bb-8va or F5+8va (usually with the + or - as superscript) meaning play an octave lower or higher, but never in the format you've presented.

Yes, a screen capture would br great.


BIAB & RB2026 Win.(Audiophile), Windows 10 Pro & Windows 11, Cakewalk Bandlab, Izotope Prod.Bundle, Roland RD-1000, Synthogy Ivory, Session Keys Grand S & Electric R, Kontakt, Focusrite 18i20, KetronSD2, NS40M, Pioneer Active Monitors.