WordPress includes jQuery v1.12.4 – by default GeneratePress does not request the jQuery library as it doesn’t require it, the only time it does is if you activate the Sticky Navigation.
Plugins requiring jQuery should ( but don’t always ) make their own request for jquery.
If you right click inspect your site and check the console can you see any errors?
Have you made any modifications to the theme templates? As currently i cannot see the wp_footer on the site which is where JS scripts would ( should ) be loaded.