su_expand content not recognized by Google

Hi,

I’m an happy user of shortcodes ultimate, and I like very much all functions which are offered. One of the shortcode I used lately is “Expand” with Read More and Read Less function.
All works perfectly, visually.

But unfortunately, when I check with the Google cache, I can notice the content inside of the Read more section is not indexed by Google.

This is the website : https://www.sinoconcept.co.uk/
This is the Google cache of the same page (in Text-Only version) : https://webcache.googleusercontent.com/search?q=cache:https://www.sinoconcept.co.uk/&strip=1&vwsrc=0

For the first Read more button, all this content is missing :
We have several factories in which we manufacture:
– Speed cushions: made with rubber and used as a public traffic calming device;
– Cycle lane dividers: installed to ensure safety for bicycles;
– Road studs: used to increase visibility on roads.

I checked on the documentation of this “Expand” button, and it’s perfectly recognized by the Google cache :
https://webcache.googleusercontent.com/search?q=cache:https://getshortcodes.com/docs/expand/&strip=1&vwsrc=0

So, what did I do wrong and what happened exactly ?

If you have some replies on this problem, it would be a great pleasure ??

Thanks

The page I need help with: [log in to see the link]