Header problem

Hi,

I have a problem with the calendar. Whenever i click on an event in the calendar, it shows the description of the event in the top of my page with grey background.. any reasons this suddently happens?

This is the url to the site:
http://5182dd22728e4bbc359ccdacbdeedc78984b920e.web26.temporaryurl.org/begivenhedskalender/

Try click the 22. september 2016 event.