Fullscreen slider image 1920 x 465 px don't show correctly

Hello,

i have an image (width: 1920px and height: 465px). I put that image to fullwidth slider, set (Slideshow Image Size) No Scaling, and the image that show uncorrectly. The image has different width and height. What’s going wrong?

If i change the image width and heigth with css, the image has now right dimension and show correctly, but has a huge margin-bottom (blank) after that.

li.av-single-slide.slide-1.active-slide {
    width: 1920px;
    height: 465px;
}

The difference you can see in 1920 screen resolution.

How can i change the dimension and the image doesn’t have that blank?

Thank you