AFQ on "[Plugin: WordPress SEO by Yoast] Post title tag issue, sitename not showing up"

WordPress Version: 3.5.1
Yoast SEO Plugin Version: 1.4.7

In the 'Post Types' tab in 'Titles and Meta' section of the SEO plugin settings, i've set "%%title%% %%page%% | %%sitename%%" as title template for posts, pages and media. But for some reason, its only showing the title of the post. The site name and page number isnt being shown.

I've added correct wp_title call in my header tag. I've set similar rules for taxonomies and they are working fine.

Can anyone please tell me whats the issue?

Thanks.

http://wordpress.org/extend/plugins/wordpress-seo/