Wrong pagination

I have set up a completely new website and used the Hitchcock theme.

The main page displays a grid with three columns and four rows. However, only one post is displayed in the last row, although there are more posts. Other posts are displayed on second page.

I have not found a setting to change this. Where can I correct this? I am using the theme version 2.0.2

The page I need help with: [log in to see the link]