Premiere Pro 2025 - Audio not going to Mix track

I've noticed this problem with a few projects now. When I playback a project, no audio is sent to the mix channel, and no mix effects are being applied. I haven't been able to find anything online that has solved it, and was wondering if there were any other things I could try. I'll attach a picture of my audio track mixer. Thanks! (on latest 2025 update)