IIS headers of aspx page appear on page sometimes, any idea why?

At random this output it occurring at the top of the page. Site is installed on a lot of servers issue only happens on one s开发者_JAVA百科erver.

HTTP/1.1 200 OK Date: Mon, 24 May 2010 04:18:30 GMT Server:
Microsoft-IIS/6.0 X-Powered-By: ASP.NET X-AspNet-Version: 2.0.50727
Cache-Control: private Content-Type: text/html; charset=utf-8
Content-Length: 39611

Use a diagnostics tool such as Fiddler to work out exactly what server its happening on, and what page is being requested, what is being responded with, etc. Then replay that request to another server. Should be able to sort out the problem from there.