Using liferea 1.8.6-1 in Debian Wheezy.
Using KDE Plasma Desktop version 4.8.4 in Debian Wheezy.
Liferea pops feed update notifications for Google Reader feeds that have already been read.
With reader notifications enabled in liferea's settings.
Right click on a google reader feed and click "update".
When the update is complete, liferea sends an incorrect desktop notification that all the articles in the feed are new articles, but they've all been read before.