your total earnings are 2.75, including the .55 from the channel. Whereas, the other 2.20 might come from other un-channeled sites [such as DP]
the 0.55 is a channel thats why it isnt added up to the total. just like how hexinator explains. the 2.20 comes from other un-chanelled pages.
Either in un-channeled ads, or occasionally the numbers don't quite add up correctly. This is not your fault though...
No need to report to Google! There's nothing wrong. It's just showing that you earned .55 from a particular channel and the rest weren't channeled.