I just noticed something in my other blog Quicoto Blog.
Somehow I had a weird line in the font code:
I don't know why but it was there and of course I don't want to link to that crappy post 😉
So the solution:
Add a remove_action in your functions.php (in your theme folder)
remove_action('wp_head', 'start_post_rel_link'); // Removes the start link
Do you have that line in your font code?