Youtube video no responsive

Good morning
today (without having touched anything in the plugins or anything else) I discovered that the theme does not reduce the size of the youtube videos, browsing from a mobile phone.

Usually I just need to insert the video link and wordpress automatically puts it in the right size.

I use Gutenberg.

I tried to disable all u plugins but the problem remains. When all the plug-ins are deactivated the theme adapts the video in width and not in height and in addition does not make it clickable.

Very serious problem

How to solve?

Url: http://www.novabbe.com

I had specified that the problem exists by visiting the site from a mobile phone.

Here is what appears to me:

1- https://www.novabbe.com/wp-content/uploads/2020/01/errore1.jpg
2- https://www.novabbe.com/wp-content/uploads/2020/01/errore-2.jpg

In the first example I inserted the video through a simple url

In the second example I inserted the video with embed

Same problem

Ps: visit a novabbe.com page to see the problem.

Problem solved
The plugin that creates conflict is “SG Optimizer” (from siteground).

By uninstalling the plugin the problem disappears.

I activated it and I realized that just deactivating the “lazy load media” and everything is fine

Thanks as always for the patience you have