If your answer was only a few of them, it would be consistent with what is found in the vast majority of organizations. Some of the failure of management personnel can be attributed to a lack of understanding of management fundamentals. Everyone has different inclinations based on their ability to learn, their interests and their personalities. And every position in an organization requires different combinations of these three attributes. Some people are very much cut out for being an accountant, for example, but the same traits and qualities that make a good accountant are rarely the same traits and qualities that make a good sales rep.
People tend to gravitate toward professions that they feel comfortable in.
This is the equivalent of forcing a square peg into a round hole. And it's likely that all of the supervisory, coaching and team building training in the world isn't going to make that person an effective manager. Unfortunately, the business community is guilty of consistently mismatching people to jobs. Nowhere is this more apparent than in the supervisory and management ranks. There are a number of reasons, but very often people are promoted into management positions because they are doing an excellent job in their current position.