scoreboard parameters not working properly

Ok i was working on a spleef minigame when i noticed some of the score= parameters were not working right so i added a dummy taco objective and gave myself that score of 5 then in the command block (which is hooked up to a 20hz clock) made it do /say @a[score_taco=6] and it said my name!! even though i had taco score =5 !! not 6!! score_ObjectiveThingHere= is working like score_ObjectiveThingHere_max !!! is this a bug?! cuz i would think it would equal the EXACT Score...?

EDIT: BUg 70001 OMG SO CLOOOSE D: