v$sesstat stores the information for a session, if you have had 100 cursor during session it will say 100. that is why after one hour the information Patrol gathers is increasing.

The qury you issued in your previous post gathers the total open cursors opened in the system. If you join v$session and v$open_cursor you could see the current open cursor for each user.

Just a note, open_cursors ´s value is per user not per system