Responsiveness hiding element

Great theme

I’m having a strange error with bootstrap or something similar. Something is causing my Image Grid to be hidden under 768 on the home page ONLY (view it on my site at- http://www.terraceattic.com.au/).

Other, non-home page pages work fine (http://www.terraceattic.com.au/index.php/projects/)

I inserted the shortcode manually in the ‘our foucus’ using php.

I’m using Portfolio Gallery- https://wordpress.org/plugins/portfolio-gallery.

What conflict could be causing this?