Are you running a squid cache or anything on your nat box? Something between you and our stats server must be caching the page.
Xede is correct, some ISPs do employ transparant caching which, if improperly configured, would result in this happening.
I can assure you, it's not on our end.
I found this thread by viewing the dozens of successful hits to your stats by people who have clicked the link you included in your posts above.
This hit looks like it might be you:
38.33.137.166 - - [16/Jul/2000:17:43:47 +0000] "GET /images/dcti128.jpg HTTP/1.1" 304 - "
http://stats.distributed.net/rc5-64/psummary.php3?id=299496" "Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)"
304 is a "Not modified" return which means that the browser and the server have both decided that the browser has the most current copy of the content. Just on a lark, check that your system's time/date are set accurately.
I think it's pretty safe to say that somewhere between us, there's a cache that's misconfigured and misbehaving. In fact, that IP resolves to "cache.infowest.net" which sure does sound suspicious, doesn't it?