apt-src question

[Simon Eilting <s-eilting@gmx.de>]

Hi,

hope this is the correct place to ask. Why is it, that when I install a 
package with apt-src, and do an apt-get -u upgrade after that, that the 
package is to be 'upgraded' to another package of the exact same 
version from the debian server? Isn't it only supposed to upgrade if 
the version number has changed? Or do I need to do something special 
after installing the from-source package? This happens with every 
package, I tried 9. I am using an up-to-date sid.
Thanks, Simon