Problem with the Alexa Rank

Hi guys,

I just checked the alexa rank for my blog and it was showing something as 11,536,671..

I was shocked...My blog had a ranking in the range of 6,00,000 to 7,00,000 fews days back, may be a week back.

But in a week how can it become from 700k to 11000k...

Is anyone else also facing the same problem?