I have installed Let's Encrypt for pmai.us which is a subsite on pmasource.co. I run online tests like https://ssl.webaware.net.au/testing/ and https://www.whynopadlock.com/check.php -- the certificate is valid, but there seems to be a redirect back to http://www.pmai.is.
I've check .htacces, wp-config.php and can't find the problem.
I'll give you access to the site to check this out.
Thank in advance for you help!