This is almost always caused by browser cache. Browsers such as IE, Firefox and Chrome, store copies of webpages in their own cache for faster browsing.
This is great for speeed, but sometimes it keeps old copies and doesnt show the recent changes. You need to force the browser to load the page from the server and not its cache.
IE (Internet Explorer) - Hold down the Shift key and click the reload button in the browser
Firefox - Hold Ctrl and Shift down then press the R key
Google Chrome - Click the blue wrench at the top-right, and select "Clear browsing data".
Safari - From the Safari menu, click Empty Cache.
