Problem with the distibution of articles in category blog

Hi, i don't know why if I set in the option of category blog (menu link) 1 article principal, 4 with only introdution, 2 colums and 4 links, I see all the article as principal. What is the problem?? plesae help me..

if you want this is the link:

http://www.alessandrodalmoro.com/thieneonline/index.php/cronaca

I see that in forum there are only one solution, deleting this folder "com_content" from template style. but it isn't the right solution. In fact if you do that you'll notice that the articles go in two or more columns, but with the principal article style. and not with the introductor article style.

anyone has another solution, please???