The Problem with Job Titles
I think the results have to do with your questioning. For example, I don't want to spend my time testing, but I have to do it if I want to write high quality software. So some people give testing a 0, because it's not something you actively want to do. And others give testing a 5, because they know that whatever job they'll take, they probably have to test their code. I don't really see much difference to the classic self-made bullet-point-list of skills.