Not all phone numbers synced to phone

I have a HTC Desire HD.
I have synced a lot of contacts from my old Symbian Nokia to Ubuntu One.
I am able to add/delete/change these contacts from https://one.ubuntu.com/ just as expected.

I downloaded and installed the Ubuntu One client to my new Android phone from the Android Market.

I am able to sync all the contacts to the mobile. If I make changes to a contact from https://one.ubuntu.com/, it is reflected in the sync.

The problem:
If I have a contact with more than one phone number inhttps://one.ubuntu.com/, for example "Mobile phone" and "Home", only one of these numbers are synced to the mobile. I have not found a pattern in which numbers are synced, and which do not sync.

If I add a number manually on the phone to an existing contact, the number is added to the contact after sync in https://one.ubuntu.com/ even if it already exists there. The result is that I have the new number once in the mobile and twice in https://one.ubuntu.com/.

Also the mapping between "Home", "Work" , "Mobile" and so on does not seem to match on the phone and https://one.ubuntu.com/ after sync.

This bug is critical to me. I am willing to do beta testing, if needed.