Changed domain, now various problems

Hi there, I recently change the domain name for a website I was working on. Everything was perfect before the domain change, but now a few things aren’t working properly. The layer slider at the top of page doesn’t show anything – it’s black. The testimonials don’t look right – the student images look low brightness and the background image isn’t showing up. There is too much open space at the bottom of the page and the social media icons seems too small.

I’m not sure how to proceed, so any help would be greatly appreciated,

Brendan