This is irritating. Can you see the sidebar on the right (the thing that shows the Recent Posts etc)? It should be situated at the top of the window. Chances are if you are using Firefox then you can see it correctly. Irritatingly it shows up at the bottom of the window in Safari (my normal browser) when you are viewing multiple posts on the front page. And I dunno why. Updating to the latest version of Safari hasn’t helped.
I thought maybe the problem was my WordPress theme, but I changed the theme to the WordPress default theme with the same result, yet the WordPress “classic” theme displayed the sidebar correctly. It’s a puzzle.