It's all basically coming from the fact that the commentators on both english broadcasting channels both vocalized a belief in Golovkin winning the fight before the announcement. One of them even out and out said that it was a fix for Canelo to get the nod.
This is why, if it's a very close fight, and you're a mike-jockey, you should just talk shop about what each guy was doing to fill time and just say 'it could go either way; lets see what the announcement is'. Because then you won't have to feel compelled to start doubling down on whatever it is your choice was if the judges didn't see it your way in order to save face; because once you've vocalized it, on national tv, you're not going to want to walk it back, on national tv.