Font not showing on mobile version

I'm a newbie to SS so thought it best to go with an existing SS template and not tweak the fonts. So I am surprised/confused why the font does not seem to work on mobiles. It reverts to a generic sans serif on some (Titles) but not all peices of text (footers, some body copy and nav seem ok). It previews ok in SS but when accessed normally from mobiles then it defaults to the sans serif. How do I fix this?? The settings look ok...
Thanks!

Hi,

Can you share link to page where you have problem?

This is the site, it is fine on desktop, but on mobiles them some of the praragraphs default to sans-serif. It happens to some extent on pretty much every page. There should be no sans-serif on the site:
https://www.toryscott.com/

Thank you SO MUCH @tuanphan that fixed it, you are a star.