Force SSL, htaccess rules not working

Now that’s a bit odd. I have a proper SSL certificate which covers:

mydomain.com
https://www.mydomain.com
static.mydomain.com

I can access all sites through https, no problem. However, when I put, say mydomain.com/blog/ in the browser is shows it via http only. That kinda defeats the purpose of having SSL for me so I tried all kinds of plugins and htaccess rules to fix it but NONE of them work.

I would like (for no apparent reason) the domain to show as:

https://www.mydomain.com

my static. subdomain already works via ssl because the Autoptimize plugin uses a CDN base which includes it already.

Could someone picture why I can still access my site via http?
Let me know what info you need.