Slider Options not showing image

I recently noticed that none of my sliders are appearing at their respective URL.

When I go into Admin>Sliders>Slider Options the image that has been saved there still seems to be saved, because it doesn’t say it’s empty, however the square box is blank and does not show the image.

Any ideas?

Example URL: https://www.ochomeinspect.com/home-inspection-in-irvine-ca/
Slider URL: https://www.ochomeinspect.com/cs_slider/irvine-home-inspection/

Subheader Style is Flex Slider