Plugin hampers Page display

Hello
I installed the WordPress SEO by Yoast plugin and after the installation, whenever I click on my pages, the content is shown in the above the site title, along with in the page. Please view the page here:

http://www.thedudewhoruns.com/running-playlist/

When I de-activate the plugin, the pages are displayed properly? WHat should I do, I want to use this plugin, without disrupting the page displays.

Please help.

Thanks

https://ww.wp.xz.cn/plugins/wordpress-seo/