"unread only" filter is not working

A feed set to show “unread only” shows many posts that I’ve already read. It used to do as I wanted but, a few months ago started to show 1-2 posts that I’d already read. Now it demand loads old post when I scroll to the bottom. This is making the UI noisy and harder to use.


What’s your username and the newsblur.com/site/FEED_ID when you are reading the feed on the web?

bcs and 6176799/schneier-on-security (though I had to change the RSS feed URL for that feed about a day or so ago).