Iphone Issue

Hi,
This maybe more related to the slider than the theme but as your support is always so excellent I wanted to try you first.

I'm building a site here: http://tinyurl.com/prtsoxc

When trying to click the links "Young People" or "Women & Equalities" in the tabbed slider apparently they arent working on an Iphone (specifically Iphone 6).
They work fine on my Android phone but unfortunately I dont have an Iphone to test the problem.

Could you possibly test this for me on an Iphone and suggest any possible reasons?.

Many thanks.