Most probably, page is cached in a browser.
You should either clear a cache (somewhere in a settings) or press "Ctrl-F5" to reload that page from a server. Also you may use "web-developer console" or some other tool to see if request actually comes to a server (or use another tool like wget to perform a request).
If it helps, you may be interested in googling "cache control headers" to control/prevent page caching.