I did a google search on "?COLLCC=" and see this is a relatively common issue. It has something to do with your server configuration and not your website files. I'd contact your hosting provider about this and get them to fix it. Most people report that it has something to do with a configuration setting for DDoS protection from Micron21 which is intercepting port 80 traffic, but I'm not sure how to fix that. Your hosting provider should be a better resource on this.