FullCalendar not displaying properly

I have suddenly started having display issues I was not having previously – so far no luck finding a plugin that is conflicting. I upgraded WordPress to the newest version and FullCalendar to 0.8.2, didn’t help. Hard to explain what is happening so here is the link:

https://bucks-spotlight.org/calendar/

I am using a child theme based on the Branford Magazine theme by Michael Oeser

Up until Christmas it was fine and I can no longer remember what I did in the meantime except adding a logo to the header and installing one plugin (which when disabled does not change anything – does it have to be completely removed?). It is the Simple Facebook Connect plugin. Oh, I also put a favicon file in the root.

Thanks for any help you can give me, I am still a novice.

https://www.ads-software.com/extend/plugins/wp-fullcalendar/