Perhaps you have been working on the issue and resolved it. I was able to visit your site and register. I was immediately logged in after this. I then visited my profile page to confirm my entered details. I was able to click on the verify button to get a verification email sent to me.
When I clicked on the link in the email the site informed me that I was registered and verified. I was able to then logout and log back in without issue. The only thing that I noticed was that I did not get a registration email and had to click the verify button to get the message. I have attached some screen shots for reference.