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I had this happen to my blog yesterday morning. I think there are 2 reasons it may happen:
1. An ad unit will only show one impression with multiple ads, so if the user went through and clicked 2 ads off of that unit that might throw off your CTR.
2. I'm not sure how link units are reported, but I think the only impression that is recorded is the link unit. Again if one person clicks on the link unit and clicks on a couple results you could have 2 or 3 clicks to one impression.
Does that make sense?
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