Practically all refrigerators have what is called a "mullion heater" between the freezer and fresh food compartments. Otherwise, the wall separating the fresh food and freezer compartments would freeze as well as the fresh food compartment. Some heaters are a bit warmer than others according to brand of appliance.
Yes unfortunately this is normal. You might want to check and see if there is any dirt or dust on your condensor coils in the bottom of the frige if you wanted too.
You should have a vent at the bottom of your frige take off and use a vacum to suck up whatever could be on the coils they also make a brush that you can buy either at lowes or home depot that you can use to clean them also.