I also have that problem or a similar one. Sometimes I change contact details in my phone and they never show up in Google contacts. After a while a sync happens and my changes are lost, just disappeared and old contact details are restored. I had that with 4.2.2 but even now with 4.4.2 it still happens sometimes, not so often anymore, but it happens. I did a full wipe after KK, but there's a problem with my sync.
Sent from my LG G2 using Tapatalk