Hi,
The issue is most likely related to the WPBakery According modules you are using on https://verdalaholidays.com/destinations/italy/lake-garda/camping-san-benedetto/.
Yoast requires a specific line of code in order to tap into those different modules. We are not familiar with WPBakery so we cannot say if it has this line of code.
We suggest contacting the plugin’s/theme’s authors and asking them if they have included the right code in all the modules for Yoast to scan.?This guide explains more and includes links to the code they need to have:?https://kb.yoast.com/kb/is-the-plugin-compatible-with-xyz-visual-page-builder/.
In the meantime, please know that even though Yoast is showing warnings as long as you know you have added the right content like internal links, images, etc., so will Google. Google will still be able to scan the source code of the page.