A positive attitude becoming less positive, or negative, or a negative attitude becoming less negative, or positive is an example of which of the following attitude change?

Incongruent

An attitude change may be congruent i.e.  it may change in the same direction as the existing attitude (like a positive attitude may become more positive, or a negative attitude may become more negative).

An attitude change may be incongruent i.e. it may change in a direction opposite to the existing attitude (like, a positive attitude becomes less positive, or negative, or a negative attitude becomes less negative, or positive).