My login.php redirects to old domain

Heya,

I just moved my WordPress website to a new hosting and followed the steps from the Codex. Everything worked succesfully, but now I just noticed the following:

When I want to login on my website I’m going to my old domain address. The page on the old website is online, so you do not notice it at the first time, but in 3 months this website will be removed and the login.php page either.
So my question is: Why will I be redirected to my old login.php page, if I have moved everything to a new server.

My old website: http://www.stafu.nl
My new website: http://www.stafu.net
If you try to login with http://www.stafu.net/wp-login.php you will be redirected to http://www.stafu.nl/wp-login.php

Is this a problem that can be fixed?

Thanks,

Ziggy

(I’m Dutch, so my English will not be the best, thanks).