I am using k2 2.6.7 on Joomla 3.2.2 and Google Webmaster Tools is showing links with the ?ml=1

www.primocraft.com/Bar-Features/Walnut-Burl-Inlay?ml=1

sh404sef is set so that the real page is:
www.primocraft.com/bar-features/walnut-burl-inlay.html

Is ?ml=1 coming from K2?

Hi. I don't think so. There is no such link in K2. Check your website to find links like that. This will help you spot the extension that is generating this.

Thanks for clarifying.

I'm guessing it has to do with a modal on those pages. I will do some more research.