VW Charity NGO Pro Slider Mobile Optimization Issue

There is what seems to be a mobile optimization issue with the VW Charity NGO Pro theme. The slider below the header appears fine within the WordPress customization page when viewing as a mobile device, but does not reflect the correct scaling and proportions when viewing the site.

I believe this issue may require development or some code editing within theme editor.

The page I need help with: [log in to see the link]