This can happen if ajenti package was installed with dpkg --force-all

Could you please obtain actual page source of the Ajenti Munin page by pressing Ctrl-U and then copying the page source? And please include your Apache vhost config. Then I'll be able to advise something.

Fix committed.

Can you give me any hint on why all URLs in page are prefixed with "STZ-SERVER_fichiers/"?

Unfortunately, AGPL doesn't impose the required restrictions either; specifically, it doesn't stop hosting companies from selling standard Ajenti while providing its source code.

Thank you for the request. I have totally missed docs/ during licensing transition.
I've just updated both ajenti.org and master branch.
And of course, Ajenti remains licensed under LGPLv3 when in the context of FOSS project such as OpenEmbedded.

Reinstalling repository key should fix this - see http://support.ajenti.org/topic/349866-installing-on-centosrhel/ - "Add repository key"

I guess this can be considered covered by Ajenti V: http://ajenti.org/

One that has graphs on it, i.e. after you select a host

Can you please also post the Munin page (http://xxxx/munin/)?