Video's don't appear

Dear W-flowers,

For some unknown reason, the (youtube) videos embedded in my website don’t show up anymore. I have just made a little change in my website (changed some text) and after publishing… Bam ! no videos to see anymore.

Can anyone help me out?
https://preview.webflow.com/preview/joost-vrouenraetss-supercool-project?utm_medium=preview_link&utm_source=designer&utm_content=joost-vrouenraetss-supercool-project&preview=31c7c556f49f46c9ab9a1571c97aad5e&pageId=5e7a2e31dd44a73e42b7f0d0&mode=preview

Here is my site Read-Only: LINK
(how to share your site Read-Only link)