I tried on iOS with Safari, Firefox and Chrome: all the same problem, the third front page content box is positioned below the first front page content box.
On my iMac/OSX with Safari it’s the same problem but Chrome shows the website correct.
Asked a friend who has a MBP with Safari and he sees the same problem. Also on his mobile devices.
When I use the custom content boxes they show nice on iMac/OSX but the layout is complete wrong on mobile devices.