I have recently created this site and allowed Google to Crawl. It returned a Unparsable Structured Data Error on page: https://slantboard.co.uk/products/tib-bar
The code which is not working is this part:
It looks like someone pasted the reviews content in the middle of your structured data. Don't delete that, but move it elsewhere so it's not inside the script tag. That will remove the error at least. You can paste it between these two lines so it should look like this:
<span class="shopify-product-reviews-badge" data-id="7345519526109"></span>
You aren't receiving the search enhancements though for your reviews as the theme data isn't connecting to your reviews. So you can win Rich Results for price and availability OR reviews. But the chances of getting all three are limited unless you use an app that integrates with Shopify Product Reviews like JSON-LD for SEO.
Looks like you are using Debut? So it should be in your templates/products.liquid file unless you've made other custom edits to the theme.