Probably because they are rated high enough to be also in the mens top 100?
Error in FIDE top 100
Sort:
AFAIK there is no such listing as men's top. When you click the generic "top players" though the URL says men.
It must have been like this for a long time... which is too bad. Such an obvious error.
http://ratings.fide.com/top.phtml?list=men
Polgar and Hou are listed in the "men" catagory.