Display problem on iOS?

Hi,
I love this theme and it looks great on my Android phone. But an iOS user just sent me this screenshot:

http://www.daveta.com/wp-content/uploads/2015/07/IMG_5829.png

The site images are duplicated/overlaid on each other weirdly.

Did I set something up wrong? Is this a bug? I’d be grateful for any help. I don’t have any iPhones so I can’t see the problem myself.

Thanks!
Maria