One problem regarding inconsistency in moral reasoning is that

One problem regarding inconsistency in moral reasoning is that it affects the harmony between our actions and inner values.

Explanation:

Moral Reasoning refers to the way in which a person identifies what is right and wrong. He uses logic in order to deal with this. This guides the principles that a person follows in life. This can be affected by several factors such as: intelligence, age, emotion, how the child was brought up, to name a few.

Consistency in moral reasoning means that a person's actions and inner values should be "consistent" or in harmony with each other. For example, if a person knows that throwing garbage along the river is bad, then he doesn't do that. He also acts as an advocate by telling people not to do it as well.

Once inconsistency occurs in moral reasoning, it causes a disharmony between the actions and inner values. It makes the person confused on what to do in his life. It becomes harder for him to follow the right path.