I have exactly the same issue. The problem does occur with Outlook 2011, Outook 15.18, contacts.app under Maveriks and El Capitan. Moreover, I cannot sync contacts using Outlook on Windows 7.
On OSX, reminders, notes and calendars work well.
Server is running latest version of smartermail. It seems that variables of address except for postcode are not transmitted. Entering data via webinterface works well and is displayed correctly.