A while ago, I had to nuke my Windows HDD to reinstall, and my WoW folder went along with it. After I reinstalled WoW though, it seemed to have both addons and addon data included with it....from 3 years ago. All of my WeakAuras, specific unit frame settings, etc.
Since when does WoW save addons and data like this? And why does it have data from 2013?