Google Adsense Click Report Does Not Correspond to MyBlogLog Statistic Report

Why sweat the small stuff as the my earning from Google Adsense is not significant yet, this is what I tell myself every time I compare the Google Adsense Click Report / Advanced Report with the statistics provided by MyBlogLog.

I am not sure whether there are people out there experiencing the same thing. The difference is quite a lot sometimes. There is even a case whereby MyBlogLog shows 9 clicks in a day, but Google Adsense Click Report shows only 5 clicks. Sometimes, clicks shown in MyBlogLog are not shown in Google Adsense Report at all! I admit that this is very disheartening. I have once given up my faith in Google Adsense.

If you guys are experiencing the same thing, mind sharing with me what makes this huge difference and what shall I do to clear up the air?