User blog comment:Kirkburn/Technical Update: May 14, 2013/@comment-452-20130515172601/@comment-5275700-20130516034127

The WAM fix is retroactive. For example, the Alternative History wiki was one of the missing ones. It is shown now, and past dates' WAM scores can be viewed for it.

Those remaining missing sixteen wikis will be resolved with an upcoming change. I will provide more details at that time (it's nothing especially controversial, it will just be easier to tell a complete story after the changes).