Reviews not showing and form not working

This is happening because your website uses both HTTP and HTTPS.

Since you have a SSL certificate enabled on your website, you need to make sure that all traffic goes through HTTPS.

Otherwise, if someone loads your website as https://... instead of https://..., and submits a review, the review will be submitting using HTTPS (since it’s available) which will cause (and is causing) a CORS (Cross-Origin Resource Sharing) security error in your browser.

If your server uses NGINX, you will need to configure it to only use HTTPS which looks something like this:

server {
    listen 80;
    listen [::]:80;
    server_name yourdomain.com www.yourdomain.com;
    return 301 https://$host$request_uri;
}
server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name yourdomain.com www.yourdomain.com;

    # etc ...
}

Alternatively, you can use a SSL plugin such as Really Simple SSL