one of my sites adsesne report does not count its clicks / page impressions .. which means the adsesne consider it as faked / invalid clicks , i changed the code with another one with the same results . The total sum doesnot include this site ..
Sometimes you need to wait a while for the clicks / page impressions to show up on the adsense reports. When you say you have changed the code i presume you are referring to the channel code.