You have the temperature setting too low - that's all.
The plate at the back is the coldest place and if you have stuff up against or close to it then the stuff risks being frozen.
My fridge is set to run at +5 degrees and yet small beads of ice form on the back plate - then they're automatically melted every so often.
The top of a fridge is the coldest - vegetables and salads which prefer to be stored at about +10 usually have a special drawer at the bottom where the air is warmer.
Store meats on the upper shelf but not touching the cooling plate. Set the fridge temperature a bit higher.
http://en.wikipedia.org/wiki/Refrigerator
Peccavi
March 2013