Why are you doing so many update queries? They all have the same condition and are modifying the same table. That can all be a single update query. Try the following action.
Global
Triggers: After New User, After User Registration
Type: Query
User: Automatic
Access: Everybody
Action
Query:
Code:
UPDATE `personeelsnummers` SET `status` = 'Geregistreerd', `user` = '[user_id]', `naam` = '[name]', `afdeling` = '[cb_bedrijfsonderdeel]', `email` = '[email]' WHERE `personeelsnummer` = '[cb_personeelsnummer]'
Please also ensure you've the latest CB 2.x nightly found below and latest CB Auto Actions 6.3.1.
www.joomlapolis.com/downloads/doc_details/640-community-builder-nightly-build
If your issue persists ensure debug mode and maximum error reporting in Joomla global configuration has been enabled so any errors that are occurring will output.