It looks like the content section on the page in the first screenshot is a category list page. If you go to the Menu > menu item and adjust the options for the list, you can change the number of items that show on a page.
It looks like you have it set to show 10 items, and it's showing 6 out of 10. Check to make sure each article is in the proper category.
Let us know if that helps.
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Go to your admin area >> menus >> your menu >> your home menu item >> is it of type Category List? If so, check to see which category is being displayed. Then go to Content >> Article Manager >> and filter by that category. The articles that are there is what displays on the frontend. If you want to display more, you can to assign the other articles to that category too.