Ok SE guru's....explain this to me.

[Dr Bizzaro]

I bought the domain fetishfreakshow.com about a year ago.

I just threw up a full page ad till I decided what to do with it. I had various sites linking to it, and it had a PR4.

Then last week, my PR went down to zero. It would have no reason to be blacklisted. Although I thought it might have been.
But I did a search and I still come up and the googlebot has been visiting multiple times daily since as well.

It's been over a week since it happened and still no PR. What's up with that?