Another track playing at the same time the main track plays

At the time I recorded my cassette I was using an older version of audacity that came with a cassette converter player from eBay
I upgraded to audacity 2.2.2 just now
I use windows 7 ultimate.
When I play back the cassette recording. I hear
The main track and another one, ( not as loud but part of the music ).
The extra track is a slow song lol
I was a song leader in church. I have 3 cassettes of the best services.
Each side is a nonstop out of one song into the next.
Not mixed… I sang sometimes for several hours nonstop.
I’m telling you this because I don’t know if it affects audacity.
The recording is off of the old audacity version 2.x.
Thank you kindly for your time,