Based on the language in this comment, I can't help but imagine you somehow let your internal biases affect your behavior and language during these interviews.
No, I've had similar experiences. I check the "two or more races" category where applicable.
What would be a property of the language in the comment that would lead you to this conclusion?
Guessing the phrase "regular... American" implying that other not hyphenated Americans are not "regular"
If someone told me they failed 10 interviews, and suspected that the race of the interviewers was a driver of that, and then extrapolated that to others of that race, I would guess that correlates to a number of other beliefs that I would care to avoid hiring for.