7 – How can I remove self-closing source tags when rendering HTML markup?

I use this markup in a node body.

<video>
  <source src="https://drupal.stackexchange.com/myvideo.mp4" type="video/mp4" />
  my title
</video>

The following markup is instead rendered in the node view.

<video>
  <source src="https://drupal.stackexchange.com/myvideo.mp4" type="video/mp4" />
    my title
  </source>
</video>

</ source> is added to the markup, and renders the full HTML not valid.

How can I avoid </ source> is added?