Continuity mistake: When Barbossa takes the sword out of his own chest, he then stabs Jack with that sword, and he stabs Jack right under the strap and buckle. As Jack walks backwards, into the moonlight, the skeletal Jack appears and now he has the sword over the strap and buckle, in his chest. The length of the sword between the guard and his chest differs greatly, as does the amount of sword that protrudes from his back.
Picture added by Super Grover
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