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Because the elder wand didn’t belong to Voldemort,
the wand only followed those who defeated its previous owner. Its previous owner was Albus Dumbledore. During the 6th year malfoy cast the disarming spell and (by the wands standards) beat him. However, since it was Snape was the one killed him in the tower, Voldemort believed he was the wands master (that is why he killed Snape) so in the final duel with harry the wand turned on voldermort because it was Harrys wand

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