Currently Being ModeratedDec 11, 2012 2:51 PM (in response to Khirrkee)
It's weird, I also have the same problem starting from TODAY, on my iPhone 4 with iOS 6.0.1.
FORTUNATELY for me, I had a backup file..!
When I re-import them on MacOS X "Address Book", they appear again for then being removed when syncing with iCloud.
Looks like there's no logic!!!
Did someone figure this out?