English follows below the Japanese
Switching off Category Exhibition
As reported in the Habitica 日本語訳 Team guild, the number of subcategories and pages were not showing in category pages, but this problem has now been resolved. The problem seems to be caused by the Category Exhibition extension, and it disappeared when this extension was switched off in Wiki Features (available to admins only).
If the problem still remains after Category Exhibition is switched off, refreshing the browser should fix it.