Next Month Button

When visiting the Events Calendar on our website, often the Next Month button does not show up: http://www.edcarlibrary.ca/?post_type=tribe_events&eventDisplay=month&tribe-bar-date=2016-03

I just noticed that only after populating events from January to March did the Next Buttons show up on Dec. to Feb. But still nothing for going into April from March.

Any help to make it show up permanently would be appreciated.

https://wordpress.org/plugins/the-events-calendar/