Page not found error when logging in

Hi,
When a user logs in in danish the redicrect url is wrong. I get on to many /da in the url. The registrationpage looks like this: http://citiesonspeed.dk/da/user/register and the redirect looks like this: http://citiesonspeed.dk/da/da/user/register. So the issue is one too many /da in the url. What to do?