Looks like a bad or missing 301 redirect. Since your SSL does not include www, I would use the following in your .htaccess
Code:
# Needed before any rewritingRewriteEngine On
### Built using the .htaccess 301 Redirect Generator from Web Site Advantage
### https://websiteadvantage.com.au/HtAccess-301-Redirect-Generator
### Place after 'RewriteEngine On' and before any CMS specific rewrite rules
# Redirect HTTP with www to HTTPS without www
RewriteCond %{HTTPS} off
RewriteCond %{HTTP_HOST} ^www\.(.+)$ [NC]
RewriteRule .* https://%1%{REQUEST_URI} [R=301,L]
# Redirect HTTP without www to HTTPS without www
RewriteCond %{HTTPS} off
RewriteCond %{HTTP_HOST} !^www\. [NC]
RewriteRule .* https://%{HTTP_HOST}%{REQUEST_URI} [R=301,L]
# Redirect HTTPS with www to HTTPS without www
RewriteCond %{HTTPS} on
RewriteCond %{HTTP_HOST} ^www\.(.+)$ [NC]
RewriteRule .* https://%1%{REQUEST_URI} [R=301,L]
## 301 Redirects
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