Accordions not stopping a previously playing video to stop

Hello,

I'm using your accordions for my music education website www.artofreggae.com.

Recently the functionality of the accordions stopped functioning on every page on the site except one.

What's supposed to happen is that when someone hits a new accordion, the current opened accordion and its content (a video and links) will close up and stop playing, and the newly opened video will start playing.

It works properly here:  https://artofreggae.com/preview-keyboard-courses-and-one-shots/

And an example, it does not work properly here: https://artofreggae.com/preview-keyboard-course-1/

Can you tell me how to make it so that when any new accordion is unfolded and playing that it shuts off the previously unfolded accordion and it content?

Thanks,

Matt J