Can anyone over @ ClickPapa explain me this vast difference in numbers

Overall stats for the past 7 days, i give it a shot with Popunders
recorded impressions from clickpapa ....

I put their code into my SmartSpots, which i use overall for my advertising needs
i have to admit i did only a test on clickpapa for a couple of hours, but the numbers where so vastly different it feels as fishy as it gets