[Debut Theme] Slideshow Adapt to Image Size Issue

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I am attempting to add a mobile image selection in my slideshow, using this as the base code. 

It's working as expected, but when I select "Adapt to first image size" it is going off of the first "mobile" image size. So my desktop image that is technically shorter is now super zoomed in and weird. 
Here's a demo preview of it.

Ideally, I want the slider to adapt to the size of the image being shown, not the hidden image. Any help would be awesome! (I also need to add back to my slider the option for full image button/linking)