Google Fonts In the title

Hi,

If you look at the CSS on that element on that page with your browser's developer tools, you can see that there is specific CSS code to force the font of that text to be the Roboto font.
And the developers tools, indicate that it comes from the file
cache/com_templates/templates/lt_foodcourt/a4d97df308fe6e43c3cd2d567a11a2aa.css
So as you can see, that file is a compressed cached file of all the CSS files normally on the page:
i.imgur.com/DLCe9PE.png
However, that hikashop.css file from which that CSS code comes from is not a file from HikaShop.
So I checked your template files with the backend access you provided and I can see the file templates/lt_foodcourt/css/hikashop.css which contains that CSS:

body.com-hikashop h1 {
  font-family: 'Roboto', sans-serif;
  font-weight: normal;
}

/* By default, hikashop set special font for heading 1, this font is ugry, unfortunate I can't found this settings, so I set it with Roboto for better display.*/

Hi,

After you change that file, you need to clear the CSS cache of the template. I'm not sure how this can be done though.
Maybe via the cache cleaner of Joomla, or maybe via some button/option of the template. It depends on how they handle the CSS caching.
So checking with the template provider is indeed a good move.