No, I don't see it as odd. GlobalSign is the root for Google's certificates, just like DigiCert is the root for Microsoft, and Starfield Technologies (GoDaddy) is the root for Amazon's certificates.
The strange thing is that some companies mix and match - aws.amazon.com is signed with their certificate, while www.amazon.com is signed with a DigiCert certificate. You'll find Microsoft seems to mix certs as well, also using DigiCert for some sites. No clue why this is.
The strange thing is that some companies mix and match - aws.amazon.com is signed with their certificate, while www.amazon.com is signed with a DigiCert certificate. You'll find Microsoft seems to mix certs as well, also using DigiCert for some sites. No clue why this is.