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I get the feeling that all three values are updating at different rates.
I agree - this morning when the Sunday stats started updating, it updated all my impressions first. Then, while the number of impressions did not change, the number of clicks shot up.
I haven't been watching the stats as closely this afternoon, but I wouldn't be surprised to see the same now.
monday stats showed continued low CTR (only 75% of what it normally is) but earnings unaffected.
today stats showed continued low CTR but earnings are down 25% as well. Further, the CTR started at some really silly low figure (about a tenth of what it normally is) but it has slowly been rising.
So far though Google always does show the right numbers at the end of the day :)