Losing first 3 seconds when exporting

I’m using Windows 10, Audacity 2.2.0. I can hear my full recording including two seconds of silence at the beginning of my .aup file. But when I export to .mp3 or .wav, it cuts off the first three seconds. Is there a setting that could be causing this or a way to make it hear that first second or two?

Do you mean that when you play the file in a specific audio player, the first three seconds are skipped?
What’s the audio player?