Why doesn't facebook accept SSL certificate?

Question

Facebook

Essence of the question.
After a year of using a free SSL certificate from REG.RU, a DomainSSL certificate was purchased from them.
FB flatly refuses to accept it and, accordingly, tags for social networks. As a result, when you try to share an article, it only shows the name of the site and the description of the site. There is no photo or description of the news. All "bugs" are registered and worked 100% before.
Through the sharing debugger, FB gives the following:

Computed Property
The "og:image" property must be specified explicitly, even if its value can be computed from other tags.
Missing monetization objects
The following required monetization objects are missing: og:url, og:type, og:title, og:image, og:description, fb:app_id

SSL Error
Can't validate SSL Certificate. Either it is self-signed (which will cause browser warnings) or it is invalid.

cURL
error cURL error: 60 (SSL_CACERT)

Everything is fine with VKontakte. Reposts go as they should.
I won't post the link to avoid being seen as an advertisement. I can send it to LS.
SSL4LESS outputs the following:
F - Certificate Evaluation The certificate
may not be supported by some browsers
And now a question!
Could this be due to the fact that the certificate is weak or incorrectly installed, or something else?