It is because of the negative head-to-head adjustment from his loss to Norris. We start at the bottom of the rankings by total score before head to head adjustments then work our way up. Before h2h Rash is 97.4%, Andrews is 98.3% and Norris is 99.1%. Rash goes first for H2H, and he did not beat anyone above him. Then goes Andrews – again no H2H. Finally Norris. He dropped significantly due to H2H from his loss at the beginning of the season to Grayson Cannon. But then he got a positive H2H for beating Andrews. After that H2H, Rash squeezed between them in the rankings, but Andrews' turn for H2H adjustments is already over. Not ideal, but if we keep going it becomes an endless loop. Hopefully it will straighten out over the rest of the season.
Hope that helps!