"www.golzarion.com" login popup in my own Forum?

[H3C x Nevz]

Hey all, I've been having some trouble with a Login Popup that first began appearing on my Forum only in the Article Section (Article Mod by Bananalive).
One of my Staff Members originally reported the problem to me, and so I disabled the Article Mod whilst I was trying to work out what was wrong.
However, it seems this happens every time I go to make a New Thread or edit an Original Post.

I did a Google search, and found that 'Golzarion' is a Coder here, but none of my installed Mods were released by him/her.

Below is a Screenshot of what appears when it happens, in Windows it says that the Username and Password would be sent insecurely.
Don't worry, I've instructed everyone to cancel it everytime it happens, as far as I'm aware no one has entered their details.



Can anyone help or shed some light on this?

Thanks!