CMS Made Simple Forums

I published my site with URL REWRITE two days ago, upgrading previous version where URL REWRITE was no active. Old address are on google cache like:
http://www.mysite.com/index.php?page ...
Most of pages are title-renamed, so i decided to prepare a "404" page inside CMSMS 1.9.4.3 through
add new content > drop down menu > error page

I putted some content inside like "invitation to search" or "please go to menu " and so on...

It works fine in most of case, whit only an exception:
if the address was a news and address is similar to:
there are 2 behaviour:
- the news exist: it is displayed inside a blank page, with no template ( see the string template false ) and the address is not REWRITED
- the news doesn't exist: 404 doesn't appear, but only a blank page with:

Categories:
Date:
Title:

I made some experiments and discovered that the "?" is the difference.
If I copy and paste the same address with no "?" eg: this case the ERROR PAGE appears correctly

Why "?" doesn't allow the old address to be REWRITED to my ERROR PAGE correctly?

bye
gianpiero