Welcome to the Shopify Community.
I read your problem and it seems that I need to analyze your website to provide a solution here.
Would you kindly share your website URL and if your website is password protected then also provide a password.
Hyde here from Shopify. Great question!
When you make changes to the metadata in your store it is not always picked up by Google, and certainly not always straight away. That is why we advise that you submit your sitemap to Google.
It's also useful to include the right keywords in your metadata, so here’s how you can look up keywords to help boost your site’s ranking.
A few other guides you may find useful for SEO purposes:
Let me know how you get on!
All the best, Hyde.