Please fill out the fields below so we can help you better. Note: you must provide your domain name to get help. Domain names for issued certificates are all made public in Certificate Transparency logs (e.g. https://crt.sh/?q=example.com), so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help.
Let's Encrypt didn't cause any error, as they didn't configure this web site. Whoever configured your site did, by configuring it to use a cert that doesn't include the site's domain name. If you're the admin for the site, you'll need to fix that. If you aren't the site admin, you'll need to ask that person to fix it.
Your site is clearly hosted by siteground.biz so that's who you need to talk to. GoDaddy is your DNS host/Domain registrar, but not your actual website webserver host.
Siteground have given your website a default certificate named after the server it's running on but configuring a certificate specific to your domain is normally up to you. It looks like they have instructions here: How to Add an SSL to Your Site - SiteGround Tutorials
It seems that your site redirects HTTP to HTTPS but you haven't provided a certificate for it - so the web server replies with the default domain / first secure vhost.
This link is great and I read thru it and it has a lot of info BUT the problem is that I cannot get into the website admin to do any of it. I will try to to get a hold of siteground.biz - thanks
