Meta title/descriptions are not updating

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I am working on my client's Shopify site and when I change the meta name/description for the home page in the preferences area in the back end it is not displaying on the live site. Instead, I just see the domain where the meta name should be. Having the same issue with product pages as well where the live site isn't updating what I added as a meta title/description. We were hired to do SEO so I don't know much about Shopify themes.  I contacted Shopify support and they told me to make a post here as the site uses a custom theme and not a Shopify supported theme.