Sometimes when you click on the back button the web page you are on just reloads. There is no way for you to stop this, but your browser isn't to blame. The web site's designer has hijacked your back button to try to keep you on their site. To get back to a site you were previously viewing, right-click on the back button then left-click on the desired link. You could also email the Webmaster and tell them you will not be coming back to their site because of this. If enough people did this, maybe web site designers will stop using this annoying practice.