Import soundtrack
Listen to soundtrack on headphones
Open “record” in audacity
Sing into mike in time to soundtrack
Music and voice are in recorded track
I just want my voice in recorded track
Why is music recording in recorded track

Could you attach a screenshot of what you’re seeing? I’m guessing your recording is in a separate track, but then the two tracks are played simultaneously.

Also, I don’t think this belongs in the Podcasting forum.