This can happen when FeedBlitz has been configured to monitor your blog's home page (i.e. as an HTML page), and not its RSS feed.  When FeedBlitz tracks an HTML page, such as your blog's home page, any change, no matter how small (such as a time stamp or an ad setting) will cause FeedBlitz to send the update, notifying you and your subscribers that it has changed (because it has changed, even if you didn't post a new entry).

The fix is to determine what your blog's RSS feed is - if you need help with this contact FeedBlitz support or our blog vendor's support group - and then configure FeedBlitz to track it. 

Once you have your RSS feed's address, go to www.feedblitz.com/f?lists and update your syndication's set up to use this URL and not the plain address of your blog.  Save your changes, and then use the diagnostics menu option to see the difference - you should see the individual articles, which means that you have successfully pointed FeedBlitz to the correct part of your site.

If this happens to you, you should check your blog to make sure that its autodiscovery links are correct, since FeedBlitz uses these to find your RSS feed automatically - and ending up with your blog's home page indicates that this process failed. It may also be failing for other RSS readers as well, so it is worth fixing.  For more information on RSS autodiscovery links, see this page.