I have tried changing SEO Title for my products using "Edit Website SEO"
However, it doesn't get reflected once I update and save it.
If I check the page source, it still shows the name of the product in the <title> tag that I had used while creating the page.
I'd like to know how can I set an SEO Optimized Title for the product page without changing the product name?
I still see on google search it showing correctly the title and meta description comparing with what you see in the code.
Search with keyword: 'coffee body care kit green opia'
I think the meta title and description showing on google search also related with the search keyword you use.
You can try search with different keywords to check this.
Also, you should check again your installed app if some app affect to meta title & description.
If it still have issue, you should hire a Shopify partner/developer to check that.