Login error – wrong URL

When I enable the login widget, users can successfully login, but WP sends the session to the wrong URL. It repeats the folder location.

Logging in at myweb.xxx/intranet/blog/wp-login.php sends users to
myweb.xxx/intranet/blog/intranet/blog/
which of course returns a 404 error from the web server.

This must be some really simple, yet stupid config that I have done.

Anybody run into this? Thanks