Infinite Scrolling of Wordpress Posts - Solve the Problem

On a site managed by CMS Wordpress, we want to implement infinite scrolling of posts. For these purposes, we use a simple plugin YITH Infinite Scrolling, the classes of the necessary blocks were prescribed in the settings, everything seems to work, but there is a problem that the posts are the same when loading. You can reproduce the problem on the main page of the site - https://clck.ru/JWCie. Tried to use other plugins, but the problem is identical. Perhaps there is a problem in the loop of output of posts.

We are looking for a contractor who will quickly and inexpensively help to find the reason for duplicating posts when loading.