NOBLOGREDIRECT problem

I have a problem with my Multi Site installation. If people write:

1) example.multisite.com they are redirected to
https://www.multisite.com.se/wp-signup.php?new=example.multisite.com

This results in a double “newblogname” when it should be example.multisite.com it becomes examplemultisitecom.multisite.com

2) https://www.multisite.com they are redirected to
https://www.multisite.com.se/wp-signup.php?new=multisite.com

This should naturally lead to https://www.multisite.com

Would really appreciate if someone could add clearness to this.

Thanks
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My wp-config.php:

define('WPLANG', 'sv_SE');
define('WP_DEBUG', false);
define('WP_POST_REVISIONS', false);

define( 'MULTISITE', true );
define( 'SUBDOMAIN_INSTALL', true );
$base = '/';

define( 'DOMAIN_CURRENT_SITE', 'www.multisite.com' );
define( 'PATH_CURRENT_SITE', '/' );
define( 'SITE_ID_CURRENT_SITE', 1 );
define( 'BLOG_ID_CURRENT_SITE', 1 );

My .htaccess file:

RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]

# uploaded files
RewriteRule ^files/(.+) wp-includes/ms-files.php?file=$1 [L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule . index.php [L]