Site counter gone mad

It seems that the counter that displays the number of users online has gone mad. It has been making wide swings for at least the last four days that I know of. Sometimes, the number is over 30k, then I refresh the page and it shows 5 or 6k, or 11k, or 33k, or 3k. Sometimes it changes with every refresh, sometimes not. It usually changes from one end of the spectrum to the other (eg, from 33k to 3k to 30k to 5k). Don't know if that's pertinent or not. Something's definitely wrong, though.

I just refreshed the page a few times, and these are the numbers I got each time:
14k
33k
14k
6k

come play site counter yatzee!

http://www.nanowrimo.org/en/forums/games-diversions-and-other-exciting-forms-of-procrastination/threads/48199