Why is it that men outnumber women in law professions, but women do consistently better?

Within law professions in the modern era, women do consistently better then their male counterparts. However, males still outnumber females and are paid higher wages. This situation begs the question: "Why is it that women are paid less if they do better?". In a study done by The University of Michigan, they completed multiple censuses of their graduates. Men outnumber female graduates/ lawyers 6 to 1. However, women had better GPAs then their male counterparts by about .6 and higher LSAT scores. However, men are promoted more often than women and are paid higher wages, not due to sex, but due to the fact that law schools and firms prefer males because they do not need to worry about males following the "mommy track". The "mommy track" is when a woman will drop out due to pregnancy and to raise a family and will put her career on hold which affects her income and the company's profits. Men are considered more consistent in work hours because they do not need to worry about pregnancy or raising a family. Unfortunately, due to the "mommy track" women are stereotyped and therefore must deal with discrimination based upon said stereotypes.