A valid Root CA Certificate could not be located,

I’m using CyberPanel on Hostinger VPS & having an issue with SSL certificate.

After creating a website & issuing an SSL, it shows a success message

“DOMAIN.COMhas SELF-SIGNED SSL. Your SSL will expire in 3649 days.”

BUT the SSL certificate is not working in the browser.

Upon checking it here (Check SSL Certificate - GeoCerts) it shows the following error message

A valid Root CA Certificate could not be located, the certificate will likely display browser warnings.

Any idea, how to fix this?