azfec on "Number of Posts"

I recently imported my posts from an old WordPress blog into my new blog on WordPress.com. Since then I have written some new posts and published them. However, they have not shown up on my site.

Furthermore, when I go to the 'Posts' section of the WP backend, it shows the following:

All (150) | Published (144)

Why would the number be different? When I click on 'All', it only shows the 144 posts.