Right now their +Page is canonicalizing to http://doutor-who.blogspot.com/, instead of http://timeywimeywickedstuff.blogspot.com/ (which is their verified URL).  So it seems that they're in the bad intermediate state between their canonical changing and the social score catching back up. It should go back up in a day or two, probably to something between 1,500-2,000.

I can't say exactly how their score could have ever been 12,000.  It's possible that at one time they were linked to some authority URL that was also linked to by another more popular +Page.  (Yes, verified URL +Page mappings are many:many, and I hate this "feature.") At any rate, 12,000 would be well above the "normal" score for a page with only 700 followers (although I suppose it's feasible).