Just happened in a game of Team BRs on Citadel. Here is a screenshot: Supa Stick... betrayal... Film clip is easier to understand. Film Clip (not rendered): Cant really post this in the Screenshot forum or Video forum because its a mixture of both, but if you have to move, do so accordingly.
Im pretty sure that it happens when the connection isn't the best and someone sticks you while you walk away at the same time, the stick will follow your movements.