Invalid SSL certificate Error code 526

This is html code

A large number of files ends there, and only for some files it reports an error with the certificate and will not be loaded. I have set up multiple subdomains and each one has a different file that is having a problem. It happens that on some subdomain everything works correctly.
I created a new certificate, and I copied the certificate that was generated to the server, but the problem was not solved. i tested the certificate and the server says it is regular

Hi there,

Blake with the support team here.

Are you able to capture a HAR file of the issue?

A 526 means there is an invalid SSL certificate.

Troubleshooting Cloudflare 5XX errors – Cloudflare Help Center

You can adjust your SSL settings to Full to work around this or make sure there is a valid certificate issued by a certificate authority.

Full (strict) - SSL/TLS encryption modes · Cloudflare SSL/TLS docs

I solved the problem. the problem was in the hosting

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