When start to creating account page returns to login page

Hi:-)
I am building a new webshop i opencart 1.5.1.3.1. I have installed a danish language package (only frontend). in settings i have chosen danish as language and english as Administration Language. I am using a costumized theme (PureNature).

My issue is when I wish to create an account. From login page i press "fortsæt" (=continue) and i arrive at the register page. So far so god. When i start typing in the fields on the register page i am returning to the login page. This is only an issue on the danish part of the webhop. In the english version everything works perfectly.

At the moment the webshop is here: http://2573.linux6.testsider.dk/index.p ... ommon/home. when asked a code it is 2017. The create account page is here: http://2573.linux6.testsider.dk/index.p ... t/register

Any ideas to solving this or where i might look for the failure? I have no clue, so I hope for some nice helpful answers:-)

Problem solved:-)