[Pharo-project] I still don't understand how this work

I took a clean pharo1.0-10502-rc1dev09.12.2. I open Monticello Browser, and of course, there is no dirty (modified) package. I select the package OB-Standard, then select the repo http://source.wiresong.ca/ob , and click on changes 1) First, I would expect to have no changes with an Image I have just downloaded, without doing nothing and even when Monticello Browser showed me there is no dirty package. But.....this showed me several changes!!!