Hi there - I can't post screenshots of what it should look like so here is a description - it is not the mobile setting because on an android device, it reformats to mobile. Only on iPhones it does not.
You should see the logo and then at the top three bars and the words Navigation and be able to click on that and the menu slides open or there is a drop down for the menu depending on the website. That is mobile. If you see the menu bar across the page and you need to zoom in to read, it is not mobile. I wish I could post screen shots. On my desktop if I shrink my screen, it changes to mobile responsive. On an Android, it is mobile responsive. On iPhones it is not. I did not try a touch - only iPhones and a few of them.
So it is not a site wide theme setting as on some devices are showing mobile responsive. And I know it is Simpleviewer vs. the theme because if I disable simple viewer the site goes mobile responsive on the iPhone.
On Wiremillbbq.com I looked for viewport and mobile in the header.php and neither word appears in that file.