CA certificate is returned incorrectly for website hosted on Legacy Linux Shared Hosting node registered in OA.
Apache server misconfguration.
Make sure that there is no 'SSLCERTIFICATECHAINFILE' directive mentioned in main Apache configuration files - here we assume that configruation files which are not related to webspaces virtual hosts
# grep 'SSLCERTIFICATECHAINFILE' /usr/local/pem/etc/apache/httpsd_chain.pem # SSLCERTIFICATECHAINFILE /usr/local/pem/etc/apache/httpsd_chain.pem
Remove obsolete 'SSLCERTIFICATECHAINFILE' directives.