slider not appearing on home page on iPad and some smart phones

Hi, my website looks great on a desktop computer and works fine on an iPhone 5 (using Safari) however on my iPhone 6 (using safari) and iPad (using safari) the slider image on the home page is missing. Also, the testimonials appear under each other instead of rotating one by one. Both these issues appear on the home page only. Do you know how to resolve these two issues? thank you.