It's region based problem. Not the contacts problem. Like mine, last time I flash the leaked 4.2.2 ROM, I will get my contacts like xxx-xxx-xxxx but if I am on my region official, I will get xxxxxxxxx.
Even on CM10.1 also having a different contacts number layout.
Samsung Galaxy Grand DUOS GT-I9082 | Stock XXAMF5 4.1.2 (2013-06-11) ROM (ROOTED) | CWM Touch Recovery 18.104.22.168
Samsung Galaxy Ace GT-S5830 | Stock DXKT7 2.3.6 (2012-10-13) ROM (ROOTED) ~Changes from time to time~
Toshiba Folio AS 100 | Cyanogenmod 10 A5 4.1.2 (2012-11-17) ROM by DerArtem | CWM Recovery 22.214.171.124
"I'm XDA newbie "