The pedigree doesn’t make sense. QH x QH should not produce Appendix. But, if that “QH” dam was really only Appendix, then it makes sense, since Appendix x QH can’t product QH, only Appendix.
I did forget that last part of the equation.
Yes, same, I’d forgotten that Appendix x QH still = Appendix
Allbreed has lots of mistakes in it, as the Appendix entries shouldn’t be called Quarter Horse because they aren’t. If Appendix isn’t an option, then that’s a shortcoming of the database as well