[CentOS] What causes phantom update nags?

My Update Applet keeps giving me messages to install an update to a
package I do not have installed. To make matters more confusing, when I
actually try to install the package it wants to update, there is a
problem with the installation.

Any tips on how to resolve this?  Is this somehow caused by the
repositories I have enabled?
-- 
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MzK

"We can all sleep easy at night knowing that
 somewhere at any given time,
 the Foo Fighters are out there fighting Foo."
                          -- David Letterman