Hello,

Most of your sliders are working and visible on my end, but some background images are missing. After investigating the issue, I found a custom CSS rule on your site that hides all images:

img,a img {
    border: none;
    padding: 0;
    margin: 0;
    display: inline-block;
    max-width: 100%;
    height: auto;
    display: none
}

As you can see, this rule contains two display properties, and the second one (display: none;) is preventing the images from being visible.

This style comes from your theme and is located in the avia-merged CSS file. You may want to delete this rule to ensure your images display correctly.