URL:Phishing - false positive, or how to fix?

Hello Daniel.
We regret for any inconvenience caused. If you are experiencing this issue with AVG AntiVirus or AVG Internet Security, we'd request to submit the URL for analysis to our developers. Visit https://www.avg.com/en-au/false-positive-file-form to submit it.

If it is only with Avast security products, please reach their support for help.

Hi,

I'm sysadmin for a  pair of websites www.capitalguardians.com and capitalguardians.com
Since yesterday they been blocked as URL:Phishing but I can't find anything wrong.
Have the been blacklisted using an old list (there was an issue months and months ago, which I fixed fairly promptly)
Alternatively, can I have some clues as to the nature of the problem?
Only Avast users have reported the block. No other AV seems to block the sites.

Thanks very much,

Hello Daniel.
We regret for any inconvenience caused. If you are experiencing this issue with AVG AntiVirus or AVG Internet Security, we'd request to submit the URL for analysis to our developers. Visit https://www.avg.com/en-au/false-positive-file-form to submit it.

If it is only with Avast security products, please reach their support for help.