Latest Post from Category showing in all the posts

All my posts from each category are shown as duplicates.

Example : Category > http://www.amitbhawani.com/blog/category/adsense/

You can check that all the posts in that category are showing the same content from the latest post of that category. This has started happening suddently.

http://www.amitbhawani.com/blog/testing-is-important-in-adsense-for-maximizing-revenue/
http://www.amitbhawani.com/blog/google-adsense-new-feature-20-ads-rotated-in-728×90-ad-box/
http://www.amitbhawani.com/blog/adsense-adult-mature-content-policies-information/
http://www.amitbhawani.com/blog/what-is-your-monthly-adsense-revenue/

All the above posts show up the same content of my latest post from the same category ie http://www.amitbhawani.com/blog/google-adsense-new-feature-20-ads-rotated-in-728×90-ad-box/

Can someone let me know if this is a bug of some plugin?
Please help me out!