Delivered every order I received yesterday but got this notice today?

I delivered every single order I picked up yesterday. Look pictures, or entered the pin.. does this mean someone reported that I didn't leave the food? Am I able to find out who claimed that and try and fight it? (I take time stamp photos of every delivery even "hand to customer" deliveries.. so I can prove I left every order as I am supposed to. How will this affect me? Will I get banned?