From the bloglines blog:
We are aware that some users have been seeing inaccurate counts on their subscription lists. This is related to the maintanance we performed Wednesday, August 3rd which included upgrades to our databases. Unfortunately, due to the massive amount of data we store, many of the systems are taking a few days to catch up with work. There is no loss of data or functionality, but the sheer size of the synchronization is causing the inaccuracies in count to occur. We are working to speed up the synchronization and remove this bottleneck from the system in the future. In the meantime, we apologize for this inconvenience and disruption to your Bloglines reading rituals.
– The Bloglines Team