Hi Megan,
Without seeing how you actually set up the gain structure with the camera, it’s hard to say what you might need to do differently.
Are you using wireless mics? Is the limiter set to “on” on the mixer? What’s the audio gain level set to (in the audio set-up menu)?
I hate to be “that guy” but this is why you need to monitor the audio in the field, using headphones plugged into the camera, or send a return to the mixer. Meters on these cameras can tell you the levels are correct when you’re actually recording distorted or clipped audio.
Sorry about your recording.
Dave