I've been using the dehummer on many clips in this project I've been working on for the past month with no issues, but just today, premiere has started routing the audio of .wav clips with the dehummer applied to my macbook speakers instead of my studio monitors. All the other clips that are not .wav, or that do not have the dehummer applied, are outputting audio correctly- it's only the .wav files I've applied the dehummer to that play through my macbook speakers instead of my studio monitors.
I've checked my audio output settings in the premiere pro preferences and they are set correctly.
if anyone else ends up having this issue: I figured out that copying the effect from a mono clip and applying it to a stereo clip was causing the issue. Applying the effect from the effects bin fixed it.