Check if Google is told to skip a page.
Paste one page from your Shopify store. Rabbot reads the robots meta tag, the X-Robots-Tag header, the redirects and the canonical tag for one page. It is one visit, and nothing about the page is stored.
Want the whole store? Run the free store audit.
Why a page goes missing from Google
A noindex in the robots meta tag or the X-Robots-Tag header tells Google to leave the page out of search.
A redirect sends Google to another address, so the old one drops out once Google follows it.
A canonical tag that points at another page asks Google to show that page instead.