If they don't check 'other' then it shouldn't matter what they put in the write-in spot. I would have accepted it as a perfectly valid ballot.
Even if there is no checkbox next to the write-in spot you could reasonably argue that it still shouldn't matter what's written there unless none of the candidates have checks.
Even if there is no checkbox next to the write-in spot you could reasonably argue that it still shouldn't matter what's written there unless none of the candidates have checks.