You have your DNS setup so that the site can be accessed as either cnczone.com or www.cnczone.com. I usually opt for the former when it works because it is shorter. However, when signing in to cnczone.com, I notice that for some time now, the gallery always says I'm not logged in although the rest of the site says that I am. When logging into www.cnczone.com, all parts work fine.
It is easy to set apache up so that it it forces the visitor to be one way or the other (i.e. always cnczone.com or always www.cnczone.com) - and this is recommended for search engines as well. Let me know if you need any help.