Tim Hortons

I purchased a steeped tea and two blueberry glazed donuts.
One for myself and one for my friend.
We drove home with our tea and donuts. Upon getting home I pulled one donut out of the bag and proceeded to eat it. Then I took second donut out to give to her and it looked like someone took a bite out of the donut. We were both in shock and disgust as I had already eaten the donut that
Was in the bag with the donut in question.
I still am shocked about this and am trying to think up excuses why this could happen. Perhaps who ever bagged the donuts tore a piece off or took a bite?! Horrible either way