CPM is base on unique views? I tested your network out and the results are odd.
Most of ads are PPC, so eCPM will be calculated on click price. You can see everything on detailed analytics including click earnings, nothing odd here. Regards
You are showing adsense ads on the publisher sites but seems like publisher don't earn anything from CPM / CPC for adsense's view / click. Perhaps you should remove adsense and show more ads from advertiser. Otherwise you are just stealing traffic from publisher to earn money for yourself.