Hmm, mine is issued by a CA.
Same problem here too: only on HTTPS version of index.php for my site.
Once I deactivated the plugin, everything https on the landing page worked.
On my site, I did not activate any WP-Security options, just stock (so .htaccess shouldn’t be a problem)
Redirect Loop Error:
Got the same issue only for my landing page when this plugin is activated. Kinda weird… https://mywebsite.com
Maybe captcha integration too!
