AVG detected and blocked URL:Mal, what is triggering this?

Hi Graeme,

We're glad to look into this & help you.
Appreciate your attempt in sharing us the link of the screenshot. However, it isn't accessible at our end. Would you be so kind to share us the screenshot here again?
Note : Please click on 'See details' in the threat notification & then share us the screenshot. 
Meanwhile, please check & let us know if this happens in a specific browser or irrespective of browsers.

When I access one of my websites via Chrome or Safari, Web Shield Alert blocks a URL:Mal threat. My question is, what is this and where does it originate? My host has scanned my websites but has not detected any unusual activity. I have run a deep scan of my computer and it has not detected anything.
AVG now alerts me everytime I access my website so I would like to find what is causing this. Any help would be appreciated. Thank you
Screenshot of error

Hi Graeme,

We're glad to look into this & help you.
Appreciate your attempt in sharing us the link of the screenshot. However, it isn't accessible at our end. Would you be so kind to share us the screenshot here again?
Note : Please click on 'See details' in the threat notification & then share us the screenshot. 
Meanwhile, please check & let us know if this happens in a specific browser or irrespective of browsers.

Appreciate your efforts in working towards fixing the issue, Graeme.
As you've already submitted the false positive request, the concerned team will review & update you the status. Please wait for an email from them.
Meanwhile, please ensure that the AVG program on your computer has the latest patches applied to it. To do so : Open AVG program - Click on refresh icon beside virus definitions (at bottom right corner) - Restart after successful update.
Thank you for your understanding in advance!

Thank you for the reply. This is the link to dropbox with the screen capture: Dropbox

I get the same problem in Safari and Chrome on my macbook.

Graeme, due to security reasons, we aren't able to view the dropbox content.
Could you please share the image on this post?
You can post the screenshot by clicking on 'Image' symbol from 'Answer' field.

Thank you, I have submitted the URL for analysis. By the way I installed AVG on my phone and it is not showing an error message when I access this site.