From the last few of the months was facing such issue during RHEL-7 based repository sync.
A file located at the url http://rhel-7-repo.example.com/RHEL7/rhel-7-server-rpms/Packages/f/firefox-91.4.0-1.el7_9.x86_64.rpm failed validation due to checksum.
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Distribution and version:
CentOS Linux release 8.5.2111
Other relevant data: