I experienced this on my blog last week: Adsense ads showing everywhere else on the site aside from the Home page.
If you're an Adsense publisher and your site is manifesting the above-mentioned symptom, this post is for you.
Basically, you just have to tell your readers that cookies and other info about them are being collected as they browse your site. Also, mention that The DoubleClick DART cookie is used by Google in the adsense ads served on your website.
There. I hope you find this helpful.