Updating my local mirror, I noticed x86_64/Packages/exiv2-0.27.0-4.el7_8.src.rpm x86_64/Packages/firefox-78.13.0-2.el7.centos.src.rpm x86_64/Packages/thunderbird-78.13.0-1.el7.centos.src.rpm which seem have been pushed into the wrong repo by accident. Confirmed by checking another random mirror in the US from https://www.centos.org/download/mirrors/.