Mapping resolves to rootdomain instead of subdir

Dear WMPUDEV,

I've set up multi site wordpress with subdirs.
I've set up the dns at the designated domain.
but when i enter the domain it doesnt seem to go to multisitedomain/subdir.
What have i done wrong?

http://www.wpbase.nl should go to http://www.wpgezogt.nl/twee but i get an error that the website doesnt excists.

and when i navigate to http://wpgezogt.nl/twee it now goes to http://wpgezogt.nl

p.s.
http://www.wpgezogt.nl/drie/

hasnt got a mapping and it does work