dangling pause button

I love now being able to add audio and video directly to my WordPress website. But lately I noticed that the Play button has a Pause button dangling from it. Pressing Play changes the Play button to the Pause button only. But pressing Pause again changes it to the Play button with a dangling Pause.
Confused? Sorry. Here’s a picture: https://s2.postimg.org/ibj2y0kw5/Image7.png

This may be caused by some styling I may have done, but I have checked my CSS and don’t see anything that specifically targets that. It didn’t look like that when I was finished styling, so this is caused by a change in one of the recent updates to WordPress.

I’m not tryna whine at WordPress, I just would like to know how I can fix it so only the Play button shows.

Thanks!