[CentOS] Can someone explain this?

Installed version of doxygen (stock CentOS 5.9):

Name        : doxygen                      Relocations: (not relocatable)
Version     : 1.4.7                             Vendor: CentOS
Release     : 2                             Build Date: Mon 11 Jun 2012 04:50:22 AM EDT
Install Date: Fri 07 Jun 2013 12:14:55 PM EDT      Build Host: builder10.centos.org
Group       : Development/Tools             Source RPM: doxygen-1.4.7-2.src.rpm
Size        : 6518061                          License: GPL
Signature   : DSA/SHA1, Mon 11 Jun 2012 07:12:14 AM EDT, Key ID a8a447dce8562897
URL         : http://www.stack.nl/~dimitri/doxygen/index.html
Summary     : A documentation system for C/C++.
Description :
Doxygen can generate an online class browser (in HTML) and/or a
reference manual (in LaTeX) from a set of documented source files. The
documentation is extracted directly from the sources. Doxygen can
also be configured to extract the code structure from undocumented
source files.

Updated version I built (I need the newer version for a project I am working 
on):

Name        : doxygen                      Relocations: (not relocatable)
Version     : 1.7.4                             Vendor: Dimitri van Heesch
Release     : 1                             Build Date: Thu 07 Mar 2013 03:35:19 PM EST
Install Date: (not installed)               Build Host: sauron.deepsoft.com
Group       : Development/Tools             Source RPM: doxygen-1.7.4-1.src.rpm
Size        : 12551071                         License: GNU General Public License
Signature   : DSA/SHA1, Thu 07 Mar 2013 03:44:05 PM EST, Key ID 2c1dec90653a4d80
Packager    : Robert Heller <heller at deepsoft.com>
URL         : http://www.stack.nl/~dimitri/doxygen/index.html
Summary     : A documentation system for C/C++.
Description :
Doxygen can generate an online class browser (in HTML) and/or a
reference manual (in LaTeX) from a set of documented source files. The
documentation is extracted directly from the sources. Doxygen can
also be configured to extract the code structure from undocumented
source files.

This is what 

rpm -hUv /extra/heller/src/RPMS/x86_64/doxygen-1.7.4-1.x86_64.rpm

tells me:

Preparing...                ##################################################
    package doxygen-1.4.7-2.x86_64 (which is newer than doxygen-1.7.4-1.x86_64) is already installed

So a package built in June of *last year*, with an lower version number is
newer than a package built in March of this year?  In which universe is RPM 
living in?



-- 
Robert Heller             -- 978-544-6933 / heller at deepsoft.com
Deepwoods Software        -- http://www.deepsoft.com/
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