Unable to add too many people to credit pages.

I've been editing the Halo: Combat Evolved Anniversary credits page and have been creating a lot of people who have no credits. When too many people have been added to the credits page, the "search to add a person" bar disappears for all categories except the ones you are currently editing (if you are adding a lot of programmers, everything except the programmers will lose the ability to add to credits page).

The same thing just happened to me.