Philippe (WMF) (talk | contribs) (edit filter manager, afttest, afttest-hide) (Created on 19 January 2010 at 12:00)
afttest and afttest-hide should probably be removed from users. They're relics from the ArticleFeedback extension, I believe.
I'm not sure if we have a maintenance script for cleaning up orphaned user groups. I also don't know if this problem exists for other user groups on the English Wikipedia or if this problem exists for other Wikimedia wikis.