Video short code and column not responsive anymore

Hi,

Recently, the youtube shortcodes seem not to be working well and isn’t responsive anymore. I am not sure whether this is due to an upgrade in the WordPress version but am currently having problems with this.

Image screenshot here: https://ibb.co/c8ZnHXj

Url with problem here:

https://beyond4cs.com/cut/the-different-types-of-grades/

Code used:

[column width="six" position="first" ]
[youtube id="6jlgfEmOQ1A" width="500" height="350"]
[/column]

[column width="six" position="last" ]
[youtube id="iLbfrG4q5ZI" width="500" height="350"]
[/column]

Can you help?