The bug

The category containing the CEO Carl Manneh under Mojang Alumni is titled Chief Executive Officers, and is incorrectly pluralized, as there is only one person who is in the category.

Here is a part of the credits that demonstrates the bug:

Chief Executive Officers
   Carl Manneh

Fix

The title should be Chief Executive Officer to be consistent with other titles that contain only one person.

Chief Executive Officer
   Carl Manneh

I am going to attach a resource pack with the fix for this issue.