"schema.org-box" is shown on website

Hi all,
maybe a dumb question. Why is the grey schema box shown on my website even if I’m logged out from my website as a WP-Admin?

http://petersloterdijk.net/werk/die-schrecklichen-kinder-der-neuzeit/ bottom of this page here (testing page).

Greetings, Roberto

https://wordpress.org/plugins/schema-creator/