This isn't surprising.  Three of my children left the State and registered to vote elsewhere.  In each case, each of my children returned a letter to the elections office here at home informing the elections office that he or she had moved out of State and registered to vote elsewhere.  The letters asked the elections office to remove their names from the voting rolls.  In two of the three cases, their names have remained on the active voter rolls as we have received mail from the elections office informing them of polling location changes.  The elections officials just won't remove people from the voting rolls even when they have evidence that they are no longer living in the district.