I don't know if this will be any help. But many years ago I had the same problem but it was with Cakewalk. I could record a new electric guitar line, straight into my DAW, and the rest of the mix would be in that track unless I wore headphones. It turned out to be my physical setup, which I couldn't figure out until my mom's voice was recorded in a guitar track that wasn't being mic'd (that took me down a rabbit hole). This was twenty years ago. If I remember correctly, I had some terrible grounding between my computer, speakers, guitar effects and something was literally acting as a terrible microphone. I recorded with headphones until I moved things further apart (speakers were on a metal rack above the mixer and next to the rack was my pc. None of which was magnetically shielded), upgraded my cables and moved to different outlets. That seemed to work in my scenario but I'm not sure if it will yours.
