A lot of places park people who can't cut it doing the actual work in the project in project management roles instead of moving them on. They think, ohh they have intimate knowledge of the project and the working parts they'll be great.

It happens a lot for regular management as well.

A properly trained, proficient project manager can get more done with less people, defuse situations before they happen and cool the jets of higher ups making unreasonable demands.

Of course, some places are just shitholes run by assholes to which none of this applies.