I'm pretty depressed that I'm finally one of the people posting this, since I'm usually telling those people "you're obviously wrong", but either I don't understand how consecutive day counting works or this seems impossible:
The last activity count is right; I was on SO at about 18:30Z yesterday (Saturday). Is it possible for the consecutive count to be at 1 if my last activity was yesterday? It would seem like it has to be at least 2 then (although I was definitely active Friday; I suspect Saturday is the "missing" day since all I did was poke through the newest question list and check the current flags)