Once one house receives 10 boxes of some type, the % filled for the bars are normalized by dividing the total received (for the corresponding house and box type) by the maximum received (over all houses and box types).
Ex. if the first house receives 20 A boxes (and this is the max over all houses and boxes), then all box types must be received at least 18 times (90% of 20) at all houses to count as a win.