Board Thread:The Quarters - Q & A/@comment-99.13.13.148-20140507013520/@comment-24150802-20140508000456

Did you install the HabitRPG Chrome extension recently? If so, that "productivity" habit is what the extension uses to add and subtract XP, GP, and Health. If you want to keep using the extension, then you need to leave that habit there. If you want to stop using the extension, then delete the extension from Chrome and remove the habit.

It is also possible that you installed a different third-party app or tool, which created the habit (more than one tool can use the same habit).