Discussions shown from all subcategories instead of chosen one

Hi,

I was trying to see only the posts in one subcategory of the forum... let's say Easy Discuss - technial issues.... I used the menu on the right hand side: Categories
The url is http://stackideas.com/forums/index/easydiscuss/technical-issues, but I get displayed all the posts from Easy Discuss category.

Is this a bug?

Kind regards,
Alex