I caot get rid of a feedback loop while reamping, despite different outputs.

AudioBox 22VSL - StudioOne3

Attempting to reamp a bass DI track with my Kemper. Everything is routed correctly, and I've followed all the usual instructions regarding I/O assignments for the tracks, and yet the feedback loop in unavoidable. I literally only have the DI track routed to Sub1, going to Kemper, every other track is to Main, which is shut off. I can't get the level close to usable without the feedback. Any ideas?