Posterboard showing code only

Hi,
sorry for bothering but in my theme SimpleMag the Event Organiser Posterboard is showing part of the code in boxes instead of the event-information like in another websites where it works perfectly.

e.g.

event_title @ event_venue
event_thumbnail
event_content

WordPress: 4.1
Theme: SimpleMag (ThemesIndep) using Redux Framework
URL: http://wp.platu25.at/kalender/

Many thanks for your help!
Chris

https://ww.wp.xz.cn/plugins/event-organiser-posterboard/