Thank for reporting this issue. I am able to replicate this on my localhost test site.
In Theme Options -> Styling -> Slideshow & Widgets Area
If I proceed to set -> Background Image of the slideshow and widgets area
And Enabled -> 100% Background Image
The background on iPad mini and probably all mobile safari devices does not work like the desktop. It only shows certain part of the background image.
I will report this issue to my employer.
Please wait for a fix in the next theme update.