Hmm. Could be mold? Probably best to toss it. (And get a refund from Wellness, of course.)
In another weird Wellness occurrence... I bought a bag of the Kitten Health (green bag) and I later noticed it has on the label "Salmon, Salmon Meal & Deboned Turkey Recipe" printed on the bottom section. Thing is... there is no such version of Kitten Health and the ingredients on the back mention the usual Chicken. (There is a salmon version of Complete Health, but not Kitten Health.) Weird.
I hope the actual food in the bag is the Kitten Health (although, as long as it isn't dog food, I should be fine!)