We’ve just started using custom targeting to prefer certain ads based on application parameters on our sites. One thing we’ve noticed:
If we have several campaigns for the same zone, and one of those campaigns targets the zone, it seems to exclude other campaigns that don’t specifically target those parameters.
So, for instance, we’ll have 4 campaigns in a zone.
Then, we’ll sell a 5th ad for that zone, and this one will have a custom target so that it only shows up in that zone.
After having one custom target, none of the more generic ads will show in that zone.
Is that normal behavior? It’s causing us to add very general custom targeting to all our ads so they’ll get in the rotation.