Pluging stopped working

Just finished a site a couple of weeks ago, using Really Simple Popup in a variety of places. I’ve been in the hospital for a week – and when I resurfaced none of the popups are working (the images just open in a page).

Probably the best page to look at is: http://wardrobeconsulting.biz/testimonials/

Can anyone tell what has happened here?

Thanks!

https://wordpress.org/plugins/really-simple-popup/