For the past month, I've been seeing the same ads on my pages pretty frequently. To be clear, I am using exclusively 728X90 text ads. Once on the top of the page, and again in the middle of the page.
The code is exactly the same code. I am wondering if I created 2 different codes, still both set to 728x90 and still text only, would that help with duplicate ads being served? Or perhaps is just bad practice to use the same code twice on the same page?
The percentage of time that I am seeing double serving is approx 20%...so it's not ALL the time. But often enough.