We have added hundreds of content sources to click and bank across many different niches. And so its possible there might be issues with some of them.
Please start by watching Dan's Tips for using Click and Bank tutorial in the support section of your click and bank dashboard.
It explains how to select content sources that will get you the content that works for your site.
If you come across any content sources that you think are really bad or are just not working well at all, please submit a ticket and let us know. We will add/replace them