Embedded Youtube video is stretched to full width

[MarinK]

Hello,
I'm using Hello Elementor as my theme and i'm expiriencing a weird behavior with one of my blog posts.
I embedded a youtube video, code:
<iframe width="560" height="315" src="https://www.youtube.com/embed/mqpXffTJTw8" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>

But when I review the post, the video is stretched, and if I right-click the youtube video and copy the embedded code from the video it shows a different iframe width than what I entered:
<iframe width="1251" height="315" src="https://www.youtube.com/embed/mqpXffTJTw8" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
What is causing this auto-fit? Is this some auto-fit within the theme?

page link:

https://marinkoifman.com/%d7%91%d7%95%d7%90%d7%95-%d7%9c%d7%a2%d7%a8%d7%95%d7%9a-%d7%90%d7%99%d7%aa%d7%99-%d7%98%d7%99%d7%a4-%d7%97%d7%a9%d7%95%d7%91-%d7%91%d7%a2%d7%a8%d7%99%d7%9b%d7%aa-%d7%9e%d7%95%d7%a6%d7%a8/