Upfront slider messing up my images.

I have resized images to fit in the slider which is difficult enough as they are not all landscape. When I resize my images the Slider messes up my images by making them bigger. Confusing. When I click Fit or Natural size the image looks good but is screwed up again after I save. Also, nothing is responsive. Nothing! And, why 1080? Can’t I change that?

The site is: http://wpdeftdev.com/garrickbowraart/