Filtering and Jahia cache

Hi,

I have a question on the Jahia cache in a container filtering context (on
the jahia 4.1.1_CVS_b6074)

We have a news page where content is filtered by year and month.

We do the following sequential tasks :


   - A first guest user choose july 2005 in the news page.
   - A second guest user choose october 2005.
   - If the first user refresh its page (and do not change anything in
   his filter criteria),
   the data showed is for october 2005 (as the filter selection is setted
   to july 2005).


This behavior seems not to be normal (cache mixing for two user sessions).
Is there any cache configuration to do ?
Is there any templating specific coding ?

Thank's