In RL, the mk14s pretty much all ran ~11 feet deep until corrected. It was not a sometimes flaw, it was consistently wrong—but the skippers did not know this, and their doctrine was to set the depth BELOW the keel.
When they calibrated them for depth, they used a dummy warhead—which weighed something like 200lbs LESS than the real one—as a result, it had to be set to over-correct for the lighter warhead, and when the real one was on, it simply always ran deep.
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