Welcome to WebmasterWorld Guest from 220.127.116.11
Some hours later, I was shure on of the first visitors, but in the 300x250 ad block had been only 2 big ads.
So how does Google think, that this 2 ads perform better than 4 ads?
I thought they make this by click statistics of each individual page.
first 120x600 or 150x600 depending on space in the content area
300x250 in the navigation.
I noticed several times 4 or 5 good targeted ads in the content area, but only 1 ad in very big letters in the 300x250 and less targeted.
It sounds like you're seeing expanded text ads. When our technology determines that a larger ad will perform better in a particular space, the larger ad will automatically be shown.
If you'd like more information, please visit this AdSense Support entry: