Contamination of food

Can someone please explain to me, why does the Nutriday smooth yogurt which is mixed berry flavor green, even blueberry is green inside, it's a pity I lost the slips so I could return it, something somewhere in the factory went wrong, I don't know if we have been feeding our kids poison or what, I always buy these flavors but it's the first time ever that it's 2 different colors. I have pictures it's a pity I can't post them