Why does iTunes 12 play the first song in an album when I've selected a different one

macOS & Mac Apps

Hi everybody. I've noticed that on my Macbook Air, mid 2013 model, when ever I pull up an album in iTunes, move through the list of songs, and press Space to play the song I want, iTunes automatically plays the first song on the album, even if the song I want to hear is farther down the list. Tonight, when I tried to play track 5 on an album, it automatically played track 1, no matter what I did. I've got cursor tracking enabled, but no routing command seems to fix this problem. What's going on? Thanks,