Pro Sites doesn't always give a password to new users

Hi,
Pro Sites doesn't always give a password to new users:
http://screencast.com/t/sK9fbR9pNL

Here I tested again with a completely fresh email, registered through a private browsing window from another ip and same thing: http://screencast.com/t/HSklVRdPq3

Why is this and what can be done to solve it?

Thanks,
Justin