It does sound like the agent isn't identifying itself correctly, but there are sites available where you should be able to check this.
On a similarish topic, chrome keeps asking me if I want to make google my default search engine... Which it already is, so I click yes, and it shuts up... Until the next time.
Something else has just occurred to me, that it could be if it only happens on the one site, and that it could be the forum software that needs updating. It's possible that it thinks say 10.1 is the latest version and it doesn't recognise the 10.2 that you have installed.
(Numbers made up cause I can't google or do links atm)