yum vs. Alert Notification Tool

[alfred at 110.net (Alfred von Campe)]

I'm running CentOS 4.2 and my CentOS Network Alert Notification Tool 
has been "red" for over a week now.  It's telling me that there is one 
package available for update, namely shadow-utils-4.0.3-58.  However, a 
"yum update" tells me there are no updates available.  I've checked a 
few of the mirrors and they only appear to have shadow-utils-4.0.3-53.  
At first I thought the mirrors may be a little behind, but it's been 
over a week, so I think something else is going on.  Anyone else seen 
this?

Alfred