Hi!
There is a problem that I created a subdomain certificate with acme.sh or Certbot.
And I get the same Certificate to R3. It does not write LetsEncrypt or anything else.
But most of all, my problem was that the site was safe before, not now.
And I want to see the certificate like it used to: Cloudflare Inc ECC CA-3
see https://letsencrypt.org/2020/12/21/extending-android-compatibility.html
Lets Encrypt now uses “R3” which is the name for their current intermediate authority until 9/29/2021 or E1 comes online. More info at Chain of Trust - Let's Encrypt
As for
Make sure the DNS record for your subdomain is 
proxied - if it’s DNS only, CF isn’t going to sit in front of your site and provide SSL/TLS or ddos protection.
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