multi track mp3 how

I downloaded loud MP3 audio from ROBXXX and imported it into Audacity.
But surprisingly, 12 tracks were imported into the Audacity.
Is there a way to export MP3 audio without mixing tracks?
Or is it just a bug?

oops not 12 i counted and they were 8 tracks

Not as MP3, because the LAME encoder (used by Audacity) does not support more than 2 channels.

You can export multi-channel files in other formats, including WAV, OGG, FLAC,… by enabling the “Advanced Mixing” option in Export Preferences.
See: Import / Export Preferences - Audacity Manual
and: Advanced Mixing Options - Audacity Manual