I use OpenX onRamp to display advertising on my site. Today I checked the statistics, and I found a "discrepancy" between the statistics tab and the inventory tab. For example, one of the advertisers paid me for 100 clicks last month. The statistics say they have received 112 clicks, but the inventory page says they have still 33 clicks left.

My questions:

- Does anybody know why is this?
- Should I switch from OpenX onRamp to hosted OpenX?
- Should I change to another adserver? if yes, which?

Thanking you,