Export mp3

My podcast is exactly how I want it when I play it back as an audacity file, but when I convert it to mp3, some of my tracks are missing. What can I do?

You will need to give more information about what you are doing and what is happening.
Which tracks are missing? How are you exporting? Are the “tracks” in one Audacity “Track” or on multiple Audacity Tracks? Are you using “Export Multiple”?
We can’t see your machine so we only know what you tell us.