Ian, my guess is that it is to do with the number of posts per day. Since you say you haven't posted in a while then your number of post per day would be lower...i don't know though, I'm only guessing really!
It's nothing to do with the amount of posts you make per day, the status goes on the total number of posts you have made.
What status did you have before? On that number of posts you would have gone from new poster to novice. I presume you weren't down as an expert,
I wouldn't worry about it. As toolbox says, it's not about your status, it's the help and support you give that counts.
Sharing from experiences of dealing with debt
The greatness of a man is not in how much wealth he acquires, but in his integrity and his ability to affect those around him positively.
Bob Marley. http://kallis3.blogs.iva.co.uk