Sync works only in one direction

[stka]

Hi,

Im using the actual synthesis client on my motorola milstone to sync the contacts and the calendar to my eGroupware-Server 1.8. Changing calander and contacts on the server works fine, but i will never get the changes from my mobile fone syncronized to egroupware. I also tried to bring all contacts from the phone to the groupware with overwriting the contacts on the server. That's also not working. Any hint where I should look?