That seems very skewed, based on hiring I've done. My suspicion is it's related to recruiters or other pipelines they were working from to provide them applicants / candidate resumes. There are definitely recruiters who have client populations that are very disproportionate (largely based on where those recruiters get their clients from in the first place).

It wouldn't surprise me if the end lesson that comes out of all this is "be very, very careful who you work with to do your recruiting and the effect it has on your applicant pool". If someone (be it a recruiter or just employees hoping for referral bonuses) pumps your hiring pipeline full of low-grade resumes but who nonetheless represent a particular ethnic group, and you end up turning them all down or turning them down at a higher-than-normal rate, you could really be increasing your EEO exposure without realizing it.