I am looking at my log files for my site, http://jimpix.co.uk

If I look at the failure log, which states:

The Failure Report identifies requests that were made to the server that resulted in an error such as a '404 Document Not Found'

I find a number of errors. I am baffled why I get a massive bunch of static images here, e.g:


these are not broken links, or unavailable files, since I can go to any of them:


and view them fine.

Why would they be flagged as 404 errors? My host doesn't know why - I checked with them first.

It makes no sense, unless the page doesn't just include 404 errors, but also 304 errors, which if I'm right is the status for cached images...