Mapping doesn´t work

Hello, 8ii.de is my networksite and
i try to map:
http://gratis-visitenkarten-bestellen.de/

The main page is mapped but the other undersites go to the original URL.

ex:
the site “Testseite” goes to
http://8ii.de/visitenkarten/?page_id=5

Permanent redirect (better for your blogger’s pagerank) and
User domain mapping page are checked.

Domainmapping: primary is checked

http://ww.wp.xz.cn/plugins/wordpress-mu-domain-mapping/