Something is wrong. None are infalible, not even cladistics.
Cladistics is a tool, nothing more nothing less.
It is a very powerful tool, but is is only a tool. It is not a mirror, reflecting reality. I had thought that the Pattersonesque view that the only three things needed to produce an accurate phylogeny were, cladistics, cladistics and cladistics, was past. Transform cladists need to get out more. Many say it was a mistake to come down from the trees, some say the move out of the oceans was a bad idea.