Yep, it is odd.
A cynic would say that you should take advantage of this situation by championing the weakest possible candidate for the position. In a couple of years when the program is a train wreck and you have your doctorate, you will have another shot at it.
Kidding. But that is why you situation is a bad idea.
Nah, a real cynic would say that they'd pick the weakest candidate all on their own.
This is odd, but I'd chalk it up to administrative ineptitude. I don't think they mean anything by it. If it were me, I'd stfu and let the committee pick whoever they wanted to pick. Don't forget to put the committee service on your vita.