I'm not sure if this is related to bug:835 or not, but the Watchers module is duplicating some users in the list on http://bootstrap-playground.wikidot.com. I'm also not sure if this is just an issue on Bootstrap enabled sites or not. I haven't noticed this on any other sites (but haven't really been looking for it either). I don't see this issue on the community site (non-Bootstrap). My other Bootstrap sites are closed or private and only have a couple of watchers. I could not recreate this on any of those sites.
The first duplicate on the list, RobOstapiuk, has been a member for over 4 years. The other duplicate watcher, 315P, is a member who just joined Wikidot 10 days ago.

I cloned the bootstrap playground twice (two separate test sites). I didn't pay much attention to anything related to "watch this site", so maybe I inadvertently added myself to the watch list twice?
Rob Ostapiuk, Principal Technical Training Engineer, Microchip Technology Inc.
Microchip Developer Help
Saw this once too on our site vkcw.net which hasn't had anything unusual done to it, and it went away again, only saw it one time, a duplicate of watcher.
77 de Lou, VK5EEE