I think this is an issue with the theme.
I don’t think I explained myself clearly enough previously.
I am using custom fonts for all headers on the site – I already uploaded the required custom font files. They show up nicely everywhere except in the header for the footer widget. Looking at the code, the footer header widget is an H3 header, so ideally the custom font files should override the default fonts – but this is not happening on the desktop version of the site. On the mobile version, the footer widget header displays as the correct custom font. I’d request you to please look into this and any pointers will be appreciated.