There are times when the same ad is displayed on a single page on my website in all 3 ad units. Just wondering if this is normal? I have seen many other ads on the site so I don't think it is a problem of google not finding relevant ads and I think google can then display less ads if that was the problem. Any ideas guys?
No i don't think so but is there a definite way to know? I think it is quite annoying, since I have 2 small ad units and one skyscraper and if the same ad is shown in all three this pretty much means the small units are useless.