You may find that during testing of this, web caching may result in you seeing the wrong page. Your browser/OS probably has a local cache, which you can usually bypass by pressing CTRL+F5 to refresh the page. It isn't that likely that a cache outside you control (e.g. your place of work, or your ISP) has cached content for the URL, but not impossible.
You can also fall foul of DNS cacheing. You can clear your local DNS cache in Windows by typing
ipconfig /flushdns and then see whether re-loading the page results in the content you expect. Again, there may be DNS cache in between you and the nameservers for this domain, and they can cause problems too based on the TTL for the record.
Finally, it can take some time for DNS changes to be reflected globally (up to 48 hours) so there is a chance that you won't see the results of your change for some time.
From what I can see your settings are correct, so probably you just need to wait a while - generally it is a lot less than 48 hours.