After upgraded my site to wp 3.9.2 I see that there are categories not showed in category admin page. I see "34 items" next to the arrows to navigate in the page and only 26 categories are displayed. Also, if I search for a "hidden" category I can find and edit it... I tried to update it but nothing changed. Then, I deleted it and added again, and it worked until after a dozen of delete/add some of them disappear again... any clues or suggestions to figure out whats happening?