H1 missing on pages

Hi.
I am using Divi and Divi Ultimate. I also installed Yoast SEO free version and with it, I put all titles, meta, etc...

The site is this: http://staging3.topitalianfurniture.com/

Here the point:
1. Inspecting all pages of my site there is no <h1>. Check yourself.

Here the questions:
1. Is it normal behaviour?
2. In case is not normal How to set it properly?
2. Does it depend on the theme or because I mixed some sections of your template?

Kindly answer point by point and in case suggest me a tutorial.

I thank you so much for your superb support.

Alex