Yeah. This is world server lag. The lag effects everyone. I believe it has something to do with syncing your client to the world and vice-versa and sometimes the client is slightly a bit (in my case, always) behind. Even when I have 60ms.
I notice in some zones, (more populated) it gets worse (by players/and/or npcs).
Welcome to the Game! Don't be discouraged by the lag though. You'll overlook it eventually
(Oh PS: They are also moving to a new data center so it could also be that too)