Instead of using KBOX_USER which the the variable used in user authentication, use one of the approved K1000 variables.
A list of the correct possible K1000 variables can be found in the K1000 administrator guide.
Supported user variables include:
KBOX_USER_NAME
KBOX_FULL_NAME
KBOX_EMAIL
KBOX_DOMAIN
KBOX_BUDGET_CODE
KBOX_LOCATION
KBOX_WORK_PHONE
KBOX_HOME_PHONE
KBOX_MOBILE_PHONE
KBOX_PAGER_PHONE
KBOX_CUSTOM_1
KBOX_CUSTOM_2
KBOX_CUSTOM_3
KBOX_CUSTOM_4
KBOX_ROLE_ID
KBOX_API_ENABLED
KBOX_LOCALE_BROWSER_ID
KBOX_HD_DEFAULT_QUEUE_ID
KBOX_LDAP_UID
Once the LDAP label has been corrected when users log onto the K1000 the LDAP label will be applied as designed.