The problem is likely to be not so much voter fraud as incompetence, with some precincts reporting numbers from individual voting machines more than once, or the elections office unwittingly adding reports from the same individual machines more than once. Corrective mechanisms and procedures usually weed out these errors before the official tally is made and reported to Tallahassee. In this instance, there is enough wrong that the Division of Elections should investigate and the Governor should consider suspension or removal of Supervisor.
Too bad voting software isn’t subject to the same rigorous quality control and stringent use guidelines as medical software.