Banner not showing on published site with iphone6 but ok with everything else?

Hi guys, I’m a newbie and creating my own site for my company. Now that i have published my site, the banner shows on every page EXCEPT the page which i have created with stacks and has sub pages with various products.

The banner shows on the mac desk top, windows desktop, partners iphone4, friends Samsung phone, ipad… but disappears on the iphone6 ???
Anyone got any ideas’s why or what i can do to get it work correctly on the iphone6.
I’m using the Tesla Pro Theme and have RW7