I did replace the code but it's still happening. I called YPN and they tried to feed me some sad story: Replace the code. When we are out of beta this won't happen. Also I asked them if I could start a poll on my forum asking who could see the ads and they said no.
Yeah, I have had this problem on 2 sites. try again in a week or so and hopefully the problem will disappear. It did on my 2 sites after a few weeks.