Cannot access all posts from Blog page

Hi there, I am using your theme, deep-light. I spoke with one of the customer support staff at WordPress.com, and they found that my page “Blog” is marked as the blog archive.
We believe that in marking so, the blog archive is generated automatically by the theme, deep-light, and that neither WordPress nor WordPress.com has any control over the design of this page. Having said all of this, I want to ask why I am not able to see older posts on that page. I see some of my posts but there are more that are not accessible. There is no button to view the older posts or any other way to see them or have them load. Do you have a workaround to make more posts appear? Or, is this a theme bug that you are aware of?”

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