OK, I found a .js file in our files directory that was being included in all new posts.
I've still got to get to the bottom of this, but it looks like the same google ad customer hit both of our sites.
google_ad_client="ca-pub-9610313674109446"
On your site, try getting rid of the
http://forums.pondboss.com/templates/xx.js file.
That'll be a quick fix, but not a permanent one.