Where can there be an error in SSL Let's Encrypt?

Question

Apache HTTP Server

There is site.com and 3 subdomains 1.site.com
, 2.site.com, 3.site.com They
have 1 common SSL from Let's Encrypt ) If you request a subdomain without the ssl protocol via http, then everything is displayed as it should be!

Answer 1

check the web server settings, where does the certificate come from????

Answer 2

Oddly enough, everything is correct, if I understand the situation correctly, then everything should be the same.
did your subdomains also get their keys or not?
Statement
1. each subdomain has its own letseycrhpt key
2. they are all active and connected
3. config to the studio