“Video quality adjusted, please play the video again.”

Hi – when going to this page

http://heymalc.net/unit/en00-introduction/

to play the video the message:

Video quality adjusted, please play the video again.

…always appears, even before the video has been played at all.

This is distracting for the viewer – especially as that sentence looks as if it is part of the post I’ve written to accompany the video. It in the same font, etc. However, it is not visible in the edit screen of the page.

How can I get rid of it please?

Thanks

Malc