Google seems to be testing a new AdSense ad format that fuses Google’s two popular ad formats adlink and box ad into one. http://www.techshout.com/internet/2006/14/google-tests-new-adsense-ad-format-merges-box-ads-and-adlink-units/
Hm i got something like that yesterday when i made a mistake lol, put two of the javascript codes instead of one, not the config, the other