Duplicate files?

[linuxmaillists at charter.net]

I have duplicate entries in my logwatch in yum so I ran

rpm -qa and dumped the out put to a file then ran

sort -d on the file

reviewed the contents and see no duplicate files so what 
would cause this in my logwatch?

 (yumex) Updated: grepmail.noarch 5.3033-1.fc6
 (yumex) Updated: grepmail.noarch 5.3033-1.fc6

 (yumex) Installed: php-pear.noarch 1:1.4.9-4
 (yumex) Installed: php-pear.noarch 1:1.4.9-4
 (yumex) Installed: php-pear.noarch 1:1.4.9-4

and several others in duplicate and triplicate.

What can I do to find what is causing this?