Youtube Video in row layout

Goodmorning!

Currently, I am having trouble with placing our youtube videos in the row layout for our site. First, we put the right code inside the row. But, when saving the page, the code changes and isn’t working anymore. Can you please help us to solve this problem?

Right code (before saving the page)
<p><iframe src=”https://www.youtube.com/embed/XZ_By8ouVu0?autoplay=1&rel=0&frameborder=&#8221; width=”448″ height=”252″></iframe></p>

Wrong code (after saving the page)
<p><iframe src=”https://www.youtube.com/embed/XZ_By8ouVu0?autoplay=1&rel=0&frameborder=&#8221; width=”448″ height=”252″></iframe></p>

Thank you!
Kind regards, Martijn

The page I need help with: [log in to see the link]