I have asked this question and had it answered this way: the %-to-win that makes you think that the move is “better” is only determined one way (let’s say it comes from the network determining position-goodness). It is like “the % to win if you don’t read ahead”.
The actual best move to play - the one the bot will chose - is the one that had the most subsequent best moves following, which is the one it has explored the most.
There appear to be some logical holes in this explanation, I’m just telling you what I read and hoping someone else will leap in and correct or fill the gaps.
EDIT: actually, let’s have a separate thread on that topic.