I suspect what you are experiencing are connection and throughput related rather than intentional acts. I've not seen any posts about a "warping" hack like there are "aimbot" hacks in some online games (and why I've stopped playing BF2 and 2142 lately).
You fire, they jump. When you fire you are creating lots of data as to the number and characteristics of your rounds and tracers (if applicable),, and all that information getting transmitted.
Use of a dial-up connection (the bane of all online play), poor connections, lots of items running in the background taking up resources (un-needed or spyware/adware, ping attacks or other hack attempts), or very low memory (thus needing more calls to hard drive space, which is slower in general) on either your, or the other guy's, system could be some of the reasons you see this "warping". Even a highly fragmented hard drive could be at fault.
Do intentional warps happen... I'm sure they do, but if they happen at the moment I fire at a guy, I'm betting it's related to throughput more than anything intentional. It's frustrating.... especially when they suddenly warp to YOUR OWN six..... but it's part of on-line play.