I have a perplexing issue with one site that I use.
Occasionally when I go to the site I find that I am already logged on; this despite the fact that I had logged off before I last left the site.
I've changed my password and deleted all cookies in an effort to circumvent this but eventually it happens again.

Any suggestions on where I could look for clues as to what's going on would be more than welcome.

Thanks in advance.