loading last 2 articles Permanently

i create articles.
ex.) article 1,2,3,4,5

if i open article1 and slide down then 2 → 3 → 4 → 5 → 4 → 5 → 4 → 5 → 4 → 5 and more.
can you tell me why this issue occur and how to resolve?

https://wordpress.org/plugins/infinite-scroll-and-load-more-ajax-pagination/