Pause button doesn't show on iPhone

I used Compact WP on my site’s The Songs page (http://bonnieandthebootleggers.com/song-list/) to play “Don’t Stop Til You Get Enough” in the first column.

It works correctly on my desktop (the play button becomes a pause button that works).

However, on the iPhone 4s (haven’t tried another phone) on Safari, the song plays when you push the play button, but the button doesn’t become a pause button. When you push the play button again, it restarts the song. Thoughts?

https://ww.wp.xz.cn/plugins/compact-wp-audio-player/