I cleared it in DM and sync from home pc to device. Then at work, I synced again. Here is what I have right now:
On DM, it shows
Address Book 288 records
Address Book - All 288 records
On BB, Contact -> Options
Desktop - 288 entries
Desktop - 0 entries
There is no way for me to delete one database.
I am not sure if this will stay this way once I sync again at home.