Slider image not appearing on mobile device

Hi, whats your site address?

https://wp2.ketteringhealth.org/learnapalooza/

It works fine as a responsive site on a regular browser but the slider image doesn’t appear on mobile device. Tested on iPhone 6S+ and Android.

Hi,
Your slider works, but all the images have a broken link.
Eg,
"https://khwpweb1002/learnapalooza/wp-content/uploads/2016/02/Mountain-1.png

https://khwpweb1002 is not a valid domain.

Check again slider settings with customizer.