Butler et al 2012 published a study indicating that male soccer players displayed increased dorsiflexion while female dorsiflexion was decreased. This was measured upon landing after heading a ball. Little reasoning was used to determine why this could be but I would propose a hypothesis: Q-Angles.
The Q-angle is measured from the Anterior Superior Iliac Crest (ASIS) down to the tibial tubercle (about 5 cm below the center of the patella). The normal angle for men is 14 degrees while the normal for women is 17 degrees. This is one of the reasons why women develop greater anterior and medial knee problems when compares to men. They have greater shear and torque on their anterior and medial knee surfaces.
I would propose the reason women dorsiflexion landing after the heading the ball compared to man gaining dorsiflexion is with the greater angle, they have a higher chance of genu valgum compared to men. While their bodies are returning to a neutral position, the path they would likely take would be external rotation which would minimize dorsiflexion.
Men would gain dorsiflexion for similar reasons, landing with more neutral knees, the ankles and Achilles tendon must used to absorb more of the shock, thus increasing joint mobility due to the force of impact.
This is merely a proposed hypothesis and would require testing however I think it is anatomically consistent with the evidence presented. I have witnessed similar behavior from high school and college female athletes during box jumps, squats and plyometric hurdle jumps. If anyone has another idea, please let us know.