[Peter DragonSlayer]

As I said I am trying to get rid of this popup on a CPA site of mine



- On the site I have a youtube video running, and my button is reffering to the http://LINK - and not the .html file itself, maybe I should do it?

[RTS]

Do you have Javascript alert script running? Might be that. Usually looks like:
<script>alert('Text Here')</script> or something along those lines.

[Crypto™]

If it's part of the CPA site's code, there's likely not much you can do, unless it's entirely your site. In which case, there's likely an

Code

$().on('beforeunload',function() {
    return "Click stay on this page";
}

That's just example code using jQuery. Regardless, if that's happening, it's probably some sort of beforeunload hook.