I am getting some problems with registration on the other website

It is asking me to to the verification thing on the mcbans server but when I go on and verify it says my account is already connected to an mcbans account but yet it isn't letting me go further than the verification.

Here's a screenshot to show what is happening.

I know I have registered before so I don't know why I have to go through it again. Hopefully I get some help thanks.