Strangest thing: effects don’t work for just one specific track when played on Deck B

As in title. Traktor Pro 4. One specific track (stems generated) isn’t impacted by effects but only when playing on Deck B. Effects work when the track is on Deck A. Effects also work on Deck B for other tracks, only not working for this specific track. Issue is in software, not hardware, as it’s the same whether I’m connected to my controller or not. I’ve checked my settings to make sure effects are turned on for all decks. Has anyone come across anything like this before? Any ideas?