AdMob impressions barely showing up from apps on SlideME

I posted two Android apps on the SlideME market a couple days ago.  They both got approved, and I see a couple hundred downloads already; however in my AdMob stats I barely see any impressions.

I had read that users on SlideME tend to download the APK off the website and then sideload them onto their non-internet connected tables…  So that would explain why the ads are not showing up, but I doubt that would be for 90% of cases.

To test, I was able to download my apps to my device with the SlideME Market app.  I am able to view my AdMob interstitial ads, and a few minutes later I saw the impressions on my AdMob console increase.  So I am puzzled by why there is a lack of impressions.

Anyone have a similar experience?