I did a quick review of the site and I don’t see a problem with the Slider/Scroller.
I see some issue which is related to Mixed content i.e. use of HTTP in the site with HTTPS.
Also, I see that you are using WP Rocket as a cache plugin. May be the scroller CSS is using that cache which might ne causing the issue.
Can you try once by disabling the plugin and see if that is creating any change?
Hope this helps.
Thank you for your reply! After a little poking around I think I found the problem was a setting in Photos Scrollers (old). It was asking to use 50 images which was more then available in the album being used.