When "Pull to refresh" is triggered, "Show more posts" is displayed no matter what

When you pull down in the feed to refresh, "Show more posts" is displayed at the bottom of the newly loaded posts whether there are more posts or not. Example: I load new posts via pull to refresh. There are more than thirty. I check back in a few minutes and pull to refresh again, and five new posts are loaded, as well as the "Show more posts" at the bottom of the five new posts.