Ultimate Facebook - only_future and show_end_date are not working

The option to suppress past events and the end date are not working at http://grad.eeworkshop.com/ (on main page "Upcoming events"). It either shows all events (including past events) or nothing. It also shows the end date.

here is the shortcode I use:

[wdfb_events for=37158221032 only_future="true" show_end_date="false"]

thanks for your help