Yup, happens occasionally. Probably just looked at the other page and went elsewhere or closed the browser.
Well it may be two reasons either ads clicked by you or it may be invalid click! Check stats later it may possible you will find earnings later in a day!
it is nornal, happens with click from countries like china and russia. And if you made these clicks by youself, then result is like yours
Well first of all this is not a good habit to post your adsense earning here and second thing this is absolutely normal, no need to worry about.