Page ID’s wrong

I have a weird problem.. when I mouse over something like the link to the about page, I see page_id numbers of like 641 or so. I think that’s wrong, but let’s assume it isn’t. Well, if it isn’t wrong, then why can’t you get to that page when you click on it? NONE of them work, except the posts themselves, such as http://www.mmdmurphy.com/?page_id=614. Tried changing themes, still don’t work. Is there some way to regenerate an index or something? Categories don’t work either, such as http://www.mmdmurphy.com/?cat=1