My guess is that there were MULTIPLE attempts to cheat by more than one faction in the race, and they crashed the system by overloading it with votes that were more than total number of registered Democrats............
Voter registration roles are subject to faults across the various states.
With today’s technology one would think the systems would much better.
One method to help solve this problem would be to mail out a new voter
card each two year cycle. Those that are not for that address are to be
returned to sender for further action, such as removing etc.