DigU Slice Unmuting by itself

Background:
Aurora AU520M, SSDR for Windows v4.1.5. Headphones attached to windows PC and using PC Audio. N1MM, FRStacks, and SDC CW skimmer.

Issue:
I have two pan adapters in windows SSDR. in Panadapter 1, I have Slice A and when using diversity with my magloop. On Panadapter 2, I have Slice B which is used exclusively with WSJTX and is set to DIGU. I never want to listen to Slice B in my headphones. If Slice B is set to say, 18.100 and I mute it, when I change bands on SliceA , Slice B will usually unmute upon changing bands in Slice A. I'll then hear FT8 in my headphones along with the SSB from SliceA. I can understand muting not surviving restarting SSDR or rebooting the radio, but I'm doing none of those things.
Am I doing something wrong?

Thanks!