Why is this? Is Cakewalk planning on fixing this?

I'm using simple instrument tracks in PRV. When I select some notes and press 8 or 2 on the number pad (to nudge up or down) all the notes in the other tracks that overlap in time with the notes being nudged get deleted. This happens pretty consistently. I haven't been bothered by it for a few months because I've been arranging rather than composing -- and when I arrange, I don't need to shift notes up or down much.

Thanks.

That's a very weird one -unless the clips are linked, and
recording option is "replacing" instead of "Blend old and new".

I wonder if a shared MIDI channel between tracks could cause such..??? It should not.