Error loading subpages - CSS not loading due to http / https issue

I am suddenly starting to get the below error - havent made any changes ... what could be the issue?

'https://www.dozenlife.com is opening fine but all other sub pages are not. e.g. https://www.dozenlife.com/product-category/rent/

'https://www.dozenlife.com/product-category/rent/' was loaded over HTTPS, but requested an insecure script 'http://www.dozenlife.com/wp-includes/js/wp-emoji-release.min.js?ver=d70ae593c3d17b2119fa34f0c73a7d9b'. This request has been blocked; the content must be served over HTTPS.