[SQU] 304 Not Modified error in browser

When viewing website pages on a particular server (maybe others as well) I
occasionally will have broken images. I'll hit the reload button in my
browser in an attempt to refresh the page, and before any HTML content of
the page is loaded, above it in the browser I get:

TITLE>

304 Not modified

The document has not been modified, you can use your local copy. HTTP/1.0
200 OK Date: Mon, 13 Nov 2000 19:00:05 GMT
Server: WebSitePro/2.3.18 (Using iHTML/2.18g) Pragma: no-cache
Cache-Control: no-cache, no-store, must-revalidate Expires:
Mon, 13 Nov 2000 19:00:05 GMT Status: 200 OK Content-Type: text/html
Content-Length: 3430 X-Cache: MISS from
cacheserver Proxy-Connection: keep-alive

I am using Squid 2.3.Stable4. It appears to mostly happen while hitting
websites on this particular server, (for example www.wregional.com) but it
seems like I remember seeing it on another site too.
Why would this be happening and is it a Squid problem? If so, how do i fix it?

Thanks

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