[Skie]

Jitter/Loss is the main culprit.

If you have a rock solid 100ms ping, your actions will happen later than others but you wont experience many issues other than this. So you'll die because someone with a lower ping shot you first, and then the server will warp your view back to where you died. This is lag. But because your ping is consistent, the server can predict your movement with great accuracy and you wont warp around.

Jitter/loss cause you to warp around because the server is not getting the updates when it is expecting them, so it is just extending its predictions based on out of date info. Once your packets get to the server, then it corrects its interpretations and other players see you warp back to where you see yourself (unless of course they killed you while your avatar was bumbling around with predicted movement)