well, this is embarrassing. I hadn't revisited my Apache configuration for years, and it turns out I had old SSLCertificateChainFile directives in my configs pointing to an obsolete cert. I was thinking that directive had to do with client certs.
Well, anyway, I pointed that to my letsencrypt cert fullchain.pem, and now all my websites check out at DigiCert.
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last updated 2020-04-14 18:42:55. served from tektonic