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Clicks Not Registering - DoubleClick for Publishers Help

Clicks Not Registering - DoubleClick for Publishers Help

I installed DFP yesterday and added an inhouse ad with a simple image creative.
Today I checked the stats and the CTR is really low: 0.13% (on 4000 impressions).

In Openx, this ad has been producing a CTR around 5% for a couple of years.

What am I doing wrong?
Is this a reporting error?