I have two expressionengine installations on the same hosting server. The live site is off of the root www directory and a development site is installed under a subdirectory under www. Everything works fine with the two sites, but I notice when I make a change to a core file (index.php for example) under the dev site, the message about a core file has been altered alert shows up in live site admin control panel as well as the dev site admin control panel. Why would this be, is something not configured correctly?