You have listed "Scoring in rounds: 11-4 Robinson, 9-5 Fulmer, 8-8 / Controversial Decision as most saw Robinson winning"
8-8 adds up to 16 rounds.
Robinson / Fullmer III
The California scoring system in those days gave one point to the winner of a round, two points if the margin was decisive and none to the loser. Even rounds got no points. That way it's possible to get a final score of 9-5 or 8-8. I admit it's a little misleading, so I've taken the "in rounds" bit out.