evercookie.js overwrites the window.name which in turn destroys the FB.Canvas.setSize method.
orginal name: "iframe_canvas_fb_https"
new name: "iframe_canvas_fb_https&btag="
Don't mind the wrong btag.
From FB: NOTE: When using this method, ensure that window.name is not overridden as that can cause issues. (source: https://developers.facebook.com/docs/reference/javascript/FB.Canvas.setSize)