Canonical issue Yoast

Hi,

I have a problem with the Yoast Plugin. The canonical tag of my homepage with the italian language selected is wrong. It should be just http://www.topsecretsicily.com but it is http://www.topsecretsicily.com/de. The other language versions of the homepage are set correctly.

I noticed the problem by trying to share the link of the homepage using the browser of my iphone.

If I deactivate the Yoast Plugin everything works fine.

The page I need help with: [log in to see the link]