I'm using studio theme and when I click on a category in the tag or category cloud it lists mos

Hello,
I'm not sure what template or php file does what I'm trying to do.
I have a lot of categories and a lot of tags. When I put the tag or category cloud in one of the sidebars and then click one of the categories or tags my resulting display is the most recent posts. When I look at the link url its showing the correct category. So what am I doing wrong that its not showing the contents of that particular category?
Thanks..