Mobile/desktop slideshow pictures in Boundless very different from each other

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I've tried everything but I cannot figure out how to resize the photos in the slideshow so they are not cut off and zoomed in to the point you can't see anything in the pic. I've tried resizing the actual photo outside of Shopify and still it isn't the same from switching desktop to mobile view. I'm using the Boundless theme after switching from Brooklyn due to the same problem. I need mobile optimized web pages which is why I picked them so please help... what can I do to fix this? Here is my shop URL

thanks in advance