add to cart latest products issue

Hi

I have a issue where to add to cart button does not work on the latest products module on the home page, the font awesome icons don't load and when click add to cart, it comes up with error undefined in a popup window

has anyone else had this before on opencart 2.3.0.2

Thank you in advance

Ian

UPDATE: I know the issue now

it's cause the URL is displayed as http://www.broadwaymediadesigns.co.uk/shop but when I add https://www.broadwaymediadesigns.co.uk/shop

the font awesome icons load and the add to cart button works perfect

how do I force it to https instead of just www

UPDATE: Sorry sorted it by amending my htaccess file to force the https part on all URL's