Ok, I have checked the site on my mobile.
It seems you have a plugin which transforms your site into a mobile version when accessing it on mobile. My advice is, as your theme is already responsive, to disable that plugin in order to get full control over your site's look.
If you click the "View Full Site" on the footer while on mobile, you will see that the mobile will now access the desktop version.
You can find your plugin in "Dashboard > Plugins"