Shopify automatically generates multiple URLs for same product item which leads to duplicate page title issue under HTML Improvements section in GWT. In some cases, Shopify is seen to generate more than 8 URLs for a single product too.
This issue can be solved by the use of rel=”canonical” tags. If Google is searching your website and sees two pages with identical page titles, a rel=”canonical” tag will let Google know which of those pages should be seen as the main page, and thus receive the “SEO Juice”.
Contact us if you find duplicate page title issue in your Shopify store and we’ll add up the rel=”canonical” tag for you the correct way.