LG L9II Sync Contacts topic

Hello,

I'm having a small problem with my LG L9 II - Stock Kit Kat Rom V20D, rooted.

I keep all my contacts on the google server, not on my phone, for better backup.

Recently, I realised that I had multiple contacts, same name, different number. So I decided to join the contacts under a single one. For example, I had John Home number with his home number on one contact, and John Work with his work number on another. I joined the two under John, so that one contact has two telephone numbers (and maybe a facebook account) linked.
And I did this for all my phonebook.
The problem is that after resetting the phone and syncing the contacts from the google server, it didn't remember my joined contacts. I again have two phonebook entries for John, instead of one John with multiple numbers.
Oddly, deleted contacts and new entries were synced. So the problem is somewhere in the joined contacts area.
Is there a fix for this? I hate having to manually join the contacts again and again after every reset/phone switch/etc.

Thanks!