Issue with Auto Overlay Script

I have deployed the Auto Overlay Script on a few of my domains, and have noticed it works fine, redirects the user to the ad etc, but when they press 'Skip' to come back to the page they were originally on, it is the wrong page. It'll often be a completely different page. From what I have observed is that it creates a link then adds it to the list, I would typically just delete the link, so that it would be re-created next time the user visits the page, however not with 129,357 links, 99.9% of which were created by the Auto Overlay Script.

I have personally experienced adverts appear more frequently than I have defined them too (I set the frequency_cap to 2).