Google Blog Search Not Indexing My Site Properly

If I do a google web search on my using the following terms “site:bumpershine.com” and I use the paramaters to sort by date, I get the most recent results to show up correctly. However, if I do a google blog search (blogsearch.google.com) and I use the same terms “site:bumpershine.com”, the most recent result I get is from August 24. I’ve got a sitemap XML installed and I’ve verified my site through google webmaster tools, does anyone have any idea why blog search is not indexing properly?