Duplications in blog watches

Am I missing something? Doing something wrong?

I have had a number of watches set up across Technorati, PubSub and Feedster for sometime now.
It increasingly seems that Technorati especially gives me the same posts again and again (and again and again) - presumably each time it does a crawl....

Have I got something setup incorrectly that's resulting in this? I have the feeds coming through Bloglines.
If not, the time wasted going through watch results that have already been displayed, but making sure I dont miss new ones is steadily mounting ...