help! slideshow fails

I have purchased Phoxx WordPress Theme and it worked great before I start putting images into the slide show on the first page.

It works fine with one image. As soon as I put another one in there, it stops displaying it. It looks like it loads an image initially and then it just disappears.

Search button on top should drop down when you click on it (works on other pages, but stops working on the home page as soon as I put another image into the sideshow).

Here is the website: https://visualartalliance.org/

Here is a demo for the theme: https://themeforest.net/item/phoxx/full_screen_preview/91032.

I have tried to contact the guy who developed it but never got response back. Any help with this problem would be highly appreciated. ??