Symptoms
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A website with a valid certificate is not shown as secure
Your connection to this site is not fully secure
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The source code contains links to non-secure resources over plain HTTP
<link rel="stylesheet" type="text/css" href="http://www.example.com/css/style.css" />
<script type="text/javascript" src="http://www.example.com/js/jquery.js"></script>
Cause
Even though the website loads over HTTPS, some of its content loads over plain HTTP, and therefore shown as not secure.
Resolution
To fix the issue, update the insecure URLs in the site's code to HTTPS connections, or remove them. A web developer can identify the affected resources.