LG Dish Washer - Dishes are dry but the walls of the tub are wet

  Check point

When the walls of the tub are wet and the dishes are dry, this is a normal condition of the environment.
This happens when the tub cools faster than the dishes, allowing moisture to condense on the walls during the dry process.
These images represent the inside temperature of the tub. When the walls of the tub cool it affects the entire tub temperature,
as seen in the image on the right. This will allow moisture to condense on the walls of the tub.

The last rinse before the drying process begins is the heated rinse. The unit relies on the heat retained by the dishes from the heated rinse

 to help evaporate the moisture from the tub.
The room air will cause the walls of the tub to cool down faster, w hich is why moisture can condense on them.

The dishes in the tub will retain the heat longer and therefore will be dry at the end of the cycle.