From the looks of it ZxMobile contacts aren't working correctly. From what we have seen it matches the first name to the contact and then goes alphabetically for the last name.

So if i received an email from Tony Stark it would pull Tony but that last name might be Averill instead of Stark because it goes alphabetical.

I have the lastest version of the Suite and Zimbra 8.0.6 on Ubuntu 12.04 LTS 64 Bit.