Hello,
I have checked the option to add row bg for the shop page on our test installs and see that it does not work even with default theme, the same situation is with custom paddings, margins. So, it’s not theme issue, most likely Visual Composer problem. Anyway if you installed Massive Addons plugin that comes bundled with our theme you can use Massive Addons bg settings http://prntscr.com/e1gf11
Regards