Load more posts button not working properly

Hi! In the blog page of the indicated website I have an issue with the load more posts button; basically, when I click on it, it just loads the already shown blog posts, and not the older ones. What can it be?
I have tried to replicate the same page and build it from scratch with elementor, using also the plugin “Ajax Load More” to change the structure, but it won’t solve the issue.

Thanks in advance to whoever may answer!

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