Recently active topics in Dipity tagged with feednurner

I created a time line for my blog spot blog. I use Feedburner for the feed so using the Blogger one you have set up did not work. I Used Other feeds button. The problem is it does not display any posts before early May. My posts go back a couple of years. How do I fix it? It is at:

http://www.dipity.com/user/billdrew/t...