May be you are getting MFA Ads ,use adsblacklist.com and you even have very less page impressions ~Fairy
If its just one day then don't worry about it. If it stays like that for a week then you can be concerned
i wouldn't worry to much about one day, if this continues long term then maybe have a panic! but its propbably an anomaly
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Make sure your visitors are able to view your ads, as in your website loads fast and properly. Try testing your site on multiple browsers.
220 clicks and just 1.77$ is a record i guess , once i got something like 50 clicks and earned 2 $ and i thought that sucked, but this... Maybe most of your visitors from india? if yes, that explains everything. Low paying locations = low paying clicks.