It is likely that you are pulling up a cached (a stored) version of your page. To fix this simultaneously press Ctrl and F5 on your keyboard to force the page to reload in the browser from fresh. You can also try clearing your cache, on IE you go to the Tools Menu then choose Internet Options then click "Delete Files".
To do this in Firefox select Options from the Tools menu, you will then find the cache options in the Privacy section. Otherwise restarting both your PC and modem might help. If you are on a Windows package, you should recycle the Application Pool (via your Control Panel > Manage IIS Application Pools) as IIS will cache some data as part of its performance management.
