Embed vimeo video's sound still active after having closed popup

Hi!
I embed a vimeo video in a column item of muffin builder, the iframe code was placed in a popup shotcode, as below: 

[popup title="Lire la vidéo" padding="0" button="0" class="header-video-popup"]<iframe src="https://player.vimeo.com/video/217628352?autoplay=1&color=f81037&title=0&byline=0&portrait=0" width="1024" height="576" frameborder="0" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>[/popup]

The video plays automatically when clicking on the popup link.

The issue is that when I close the popup frame, I can hear the sound of the video playing as if the video had looped.

Can you help me with that issue please? Thank you!
here are some screenshots : 

image

image

Sound is still active after closing the popup : 
image

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