Refreshing the page results in only last post showing

In the lower part of our page we have a sections showing reviews from customers powered by your plugin with the load more button that displays one post at a time.

When you click load more to display all the posts then refresh the browser window you only get the last post displayed and all other previous ones disappear.

Is it possible to keep displaying all posts?

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