Google might be noticing invalid clicks coming from your website. They give you no money for invalid clicks. As for the 0.02, you might be getting MFA ads (adsblacklist.com to block them) which are paying very little.
If they're chinese ads, that means they must have low paying bidders? Anyways, it does sound like an invalid click.
click from public service ads yields a 0.00$ click, that is maybe the reason why you've got that amount.
yes,tell google for ever click that is invalid or you made zero cents from. while your at it, tell them not to count all the invalids so there isn't so many threads about it in the DP forum.
If you click on your own ad accidently, or get an invalid click on your site, you wont get any thing for the click/clicks. I got 2 clicks yesterday but $0.00. You could have received the clicks from some Pakistani IP or other Asian IP. Mostly, clicks from US users earn $$. Asian IPs dont earn much.