Ok, so here's a strange feature
Go to your profile, click on the answers tab, click to page two or three or so, then click on one of the questions in the list that you have answered.
Now, once you're on that question, hit the back button to return to that selected page in the answer list, now scroll up and look at your Total Reputation, it seems to show your Total Reputation from when you answered that question, not your current Total Reputation?
EDIT: Here's screenshots, I'm using Windows 7 with Google Chrome 18.0.1025.168
Screenshot 1: I navigated to page 5 of my answers, as you can see my rep is fine:
Screenshot 2: I clicked on the question visible in Screenshot1 entitled (JQuery UI Tabs targeting Dynamic tag from a link)
Screenshot 3: Going back in the browser (In this case I pressed backspace to go back), you can see that my rep is a lot lower: