sort order changes when published entry is changed

Hi all,

when I edit a published entry it moves up in the coreblog
view. So obviously, 
an edit of a published entry seems to set the 'Date' index
in the catalog (I 
looked at coreblog2 code, and the sort_order is determined
by the 'Date' 
index). Is this normal plone behaviour or related to
coreblog2? Where can I 
change this behaviour?

I use plone2.1.2 and the latest coreblog2.

Thanks in advance,

Jens
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