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Few possibilities
Is the fridge full of food? I only ask because if a fridge is not kept with a lot of food, then there are not enough things to absorb the cold, and it could freeze items.
Placement of items as some newer fridges have airflow on the back wall and if blocked those items could freeze.
Door seals? If a worn door seal will not allow the unit to cycle properly it could cause this as well.
Throw a manual thermometer in there to see if the temp is true. Move the frozen items to another shelf to eliminate placement with airflow.
