CMS older articles not showing preview pictures
 

We recently changed the name of or website, and while moving some older articles down on the home page, I noticed that many of them no longer are showing the small pre-view picture that they used to. We are using the 3 column fixed - liquid - fixed grid, and the content is set up to display the #1 article at the top in its entirety, with the rest of the articles in two columns below (displays the last 8 articles). There is a picture at the top of each article, and that picture should/always did display when the article was moved from the #1 spot to lower in the page. Can anyone tell me why this might no longer be displaying?

TIA

the url is www.knightsofillusion.com