Hello Mike,
I suspect the reason is due to duplicate / invalid clicks.
See InvalidClicks field of the campaign performance report.
Click performance report still returns all the GCLIDs as we can't tell
which one actually stayed on your site. Please use campaign / ad group
performance report as source of total click numbers.
-Danial, AdWords API team.
On Wednesday, July 30, 2014 8:48:54 PM UTC+4, Mike Deck wrote:
>
> I've discovered an issue recently where some of the numbers in my system
> aren't matching up with what is reported by the AdWords UI. I've traced it
> back to the fact that if I run a CLICK_PERFORMANCE_REPORT for a given day
> without any filtering there are more unique GCLIDs reported than total
> clicks across my account reported in any of the other performance reports.
>
> Does anyone know why this is or how I can account for the discrepancy?
>
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