The inferior team got lucky. It happens from time to time - esp. if their opponent wears blue and green.
Psst . . . in NHL playoff hockey, stats are meaningless. The only reality is what happens on the ice, and on the ice, the reincarnation of the Big Bad Bruins buried your sissified, dandified, unsportsman-like (Malhotra excepted), entitled, petulant, heroically-underperforming "Nucks."