I might be wrong but I think that since I've added the new mobile code ads that Google requires us to add before May, the wp-touch code needs to be changed also because the code doesn't match anymore with the new one.
Now it's something like this:
google_ad_client = "ca-pub-***MYCODE***";
google_ad_slot = "***MYCHANNELCODE***";
google_ad_width = 320;
google_ad_height = 50;
I have doubts that with my new code added in wp-touch, clicks are counted or not. So today I tried clicking one ad with my iPhone and for now nothing has been counted by Google Adsense.