When you pick a server to play on, make sure the ping is low (relatively 0 - 150) Anything over that can cause disruptive lag.
If there are other players in the game with over 300 ping, they could be causing the problem as well.
As for the "moonwalking" and shooting & switching weapons when you don't even move, it's a game glitch. If it happens, press and hold tab until the score comes up, it should stop then.
~FOG|Bazooka_Joe
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