[CentOS] How can rpm "%{SUMMARY}" not be consistent?

Wed Nov 16 14:56:13 UTC 2011
John Hodrien <J.H.Hodrien at leeds.ac.uk>

On Wed, 16 Nov 2011, Akemi Yagi wrote:

> What you are seeing is indeed odd. I see 'version 3.1' but not '3.2'
> anywhere on the Summary line of bash. What is your kernel by the way?
> uname -mr ?
> Have you cleared yum cache? Not just running a 'yum clean all' but
> emptying the /var/cache/yum directory ?

Why would yum cache have any bearing on what rpm reported?