Initial apt-get upgrade installs same version packages

Hi,

I recently did a fresh install of Simply Mepis 3.4-3 (not an upgrade) and then followed that with "apt-get update" and "apt-get upgrade" from the preconfigured pool "apt.mepis.org/3.4 etch main".

I was surprised that the "apt-get upgrade" installed several packages that were of the same version as already installed. These packages included several kernel drivers and a kernel image (linux-image-2.6.15.1-586tsc version 2.6.15-3.ww1).

Why would "apt-get upgrade" install versions of packages that were already installed ?

Thanks,
Declan