Ghosts using doublejump to move unseen???

Ok so I've been playing ghost matches lately and well I've noticed some ghost players use the double jump glitch to move unseen. As in literally move unseen when done right it wont register your character as moving so you wont appear for even a split sec for the enemy to spot you while you jump up next to them. Same with the normal jump if done right you can move unseen though its a lot slower.

So is it suppose to be like that or are they little bugs in the design of the ghost side?

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