In the last couple of days, I am noticing that if I do a search and arrive at my site the ad that shows up looks pretty relevant. But then I click on a second page and it the same ad. Click another page, same ad. This goes on and on and on. I'd say the same ad is showing for the first 5-6 impressions. How does this make sense for the user or me the publisher? It's like ads are not rotating evenly.