I first accessed the NYC Bagel Deli site via their Twitter accounts bio blurb which wrongly links to the http (non-secure URL http://www.nycbd.com/) version of the site.
After updating a site from http (not secure) to https (secure) make sure you update ALL links you have access to including links from social media accounts like Twitter.
Missing a few http backlinks isn’t a major SEO issue, but not updating them all AND not 301 redirecting all http URLs to https is a problem.
The nycbd.com domain can be loaded via the secure (https) and non-secure (http) versions, someone dropped the SEO ball when the site (it’s an old site so started as http) was upgraded from http to https.
Google considers https as an SEO ranking factor, this oversight can cause ranking problems.
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