resize mobile slideshow to fit mobile only photos

[lightwork]

I added code to give me the option of adding specific images for mobile only, within the slideshow. I have to select "adapt to first image" in the slideshow settings so my images aren't cut off in desktop/widescreen view. But when I do this it also changes the size of the mobile image to match the width of the desktop image; so it is taking my square mobile images and cutting the top/bottom off to make them fit within a rectangle shape. 

My site is www.inspirelightwork.com

would be so grateful for help with this