Thanks to forum and your message, i know now why when i tempt to filter out cache lasting more than 1h (selecting red bar on hourglass in exclude pane) i get the number of cache back when submitting, but it is not recorded. But your explanation is not true, excluded attribute seems to be never recorded in the query!
I tried include parking, exclude more than 1hour, it works at submitting, but when going back to list and re-entering the query, only the include is retained. I will start a new subject coz i don't know how to report such a bug. Could you help me?