Posts not publishing

Website URL: http://www.avillafan.com

Over the last few days my wordpress doesnt seem to be publishing/showing articles up on the main page but i dont know why?

No changes or updates have been that I am aware of.

The thing is – when they are published, the article links are showing on my twitter feed so people can view the articles that way but not on the main page

Article 1: http://avillafan.com/site/5371/preview-aston-villa-host-west-ham-utd/

Article 2: http://avillafan.com/site/5380/a-vital-victory-for-villa/

But they can also be seen on the catergory page (http://avillafan.com/site/category/match-reports/2012-13/)

But not on the main page: http://www.avillafan.com