I reported this problem in the pypi site issue tracker (issue 3396924):
https://sourceforge.net/tracker/?func=detail&atid=513503&aid=3396924&group_id=66150

However it seems that is a python bug.

If in one package's setup.py I provide maintainer (with email) and author (whit email) after the "python setup.py register ... upload" I create a new package where I see the maintainer as a creator.

If I manually fix it through the pypi user interface all works, so seems that this is only a bug of the register procedure.

I think this is intended behavior.  When the author of a project is the one to register with PyPI, they use the author and author_email fields, which get displayed at PyPI.  When it is not the original author but someone else who packages and registers a project, then they fill author and maintainer entries, and PyPI uses the maintainer/maintainer_email values as person to contact.

I'm quite sure that after gettint ownership on an already existent package (with a different author inside) and I added the maintainer (with my name) I get the author override. But maybe I don't remember exactly...

Is not simpler (to understand) to keep always the approach to keep both?

> Is not simpler (to understand) to keep always the approach to keep both?
Well, there needs to be one point of contact.  If someone takes the responsibility to make a project available on PyPI without asking the author to do it themselves, then that someone is responsible for the PyPI distribution.

This was already explained in #962772.