Hi Ofi,
It's not the left and right arrows that are the problem. On the first 3 slides there are button links created to take the viewers to either a new page or a related blog post. These button links on the sliders are not working on mobile when you click them. I've gotten them to work every so often but for a lot of people that have tried they are unable to click them on mobile.
I'm not sure if there is a margin/padding overlap issue that i'm not seeing in the inspector view or what the issue is but they can't be clicked on mobile devices.