Strange issue. A friend of mine asked me to pull off some audio from a reel that was made in the 60’s. When I play the tape, I can hear the correct track audio playing in the right direction, but I also hear the reverse track, of course, playing in reverse. Both tracks are at the same volume levels, just playing over the top of each other. I am playing this on a Pioneer RT-707. It plays all of my other tapes fine, both directions. What is the issue here?