Pedigree Query

What the...?
Someone get loose in the stallion barn?
Can't they DNA test?

The mandatory DNA test will, of course, figure that one out. When a horse is listed like that, it means the mare was bred to both stallions after not getting in foal to one of them.

Like, some mares sold in foal to "Cigar or ______" but obviously Cigar was not the papa.

The fact that she has been bred four times (far beyond DNA testing requirements) and that she's showing on the pedigree page as a Summer Squall mare should answer the question.
Curious on why they would still list the Chief's Crown mating as obviously they've proven her parentage.