I understand your frustration man, it happened to me as well many times, there must be some kind of logic for sure, I think it might have to do with total closeness on the season total, the lower number of closeness I guess the better, at least that's what it says on the superbru site, maybe it would be wise to shoot them an email and ask what kind of logic they use for determining the yellow cap in such cases.
Anyway not much left in the season, we still battling for that number 1 spot, I am really enjoying the competition between us, looking forward to the next round.