I never decorate with sandstone, but I was curious so I popped into customization and if I'm understanding the dilemma, for some reason some very similar pieces are available with the main sandstone wall tab, as well as similiar pieces under the "misc" tab. The ones under the MISC tab line up a little strangely so I'm guessing that's where you're having issues. I'm in the CC client, don't know if EC is the same setup.