No sound when mixdown

I'm recorded audio into audition using a Scarlett Solo 3rd Gen and when recording, all audio sounds great.

I tried to mixdown the entire session and only secondary audio I added in from another source (not my mic) can be heard. I tried downloading it as a .wav and .mp3 to test, checked different headphone jacks, and tried to listen to the mixdown on my phone and nothing plays except the secondary audio.

I've never had this issue before and I have absolutely no idea how to fix this.