slider not working after going live

Hi there

After taking the following site live, the slider showcasing portfolio work (clicking on thumbnails) seems to be broken/not showing images anymore:

https://www.globecreative.co.za/work

Everything was working fine before and not it seems that a so-called “flexslider” seems to be causing these issues. In my admin panel there is no tab for flex slider settings, and the same under tools/settings/appearance/plugins etc. I do have Revolution Slider and Cute Slider WP that i have tried playing around with but these do nothing.

I have verified source images and created new portfolio items to no avail. Any idea what the cause might be? The theme I am using is called Goodwork