Forum Moderators: martinibuster
A situation like this - where the same Google ad appears in two frames on the same page - is prohibited by our program policies and is referred to as 'double-serving'. Therefore, we ask that all AdSense ad code be placed in the same frame when using AdSense.
If your site does not use frames, though, I'd have to see the specific site to figure out why this is happening. If you do not feel comfortable sticky mailing me your URL, you can also email adsense-support@google.com and a representative will investigate further.
So maybe that's what you saw?
I just went to my site and I'm seeing a truly duplicate ad right now!
ASA: I am stickying you my URL plus the location of a screen grab I just made of the condition.