This isn't overly rare. Usually is the result of very close scores in these two categories and maybe a little larger score gap in other areas such as band or what not. Or the competition uses raw number scores for captions but judge rankings for final placements, etc. There are other possibilities, too, I am sure. I'm not sure which is the case here.
I watched the live feed back and filled in preliminary awards. With all respect to the folks at De Pere, that prelim awards ceremony was painful. Anyhow, if I missed anything or if folks want to fill in Mayville's best male soloist's name, please do so.