Tapping iAd via AdMob is triggering RANDOM clicks on sprites in my scene.

Hi everyone.

I'm experiencing a very strange error that I can't seem to figure out.

I have a 2D game with sprites on screen, with 2d Box colliders on them, and simple code like this on each sprite:

On the SCORES button:

 void OnMouseUp()
 {
     gameController.TriggerScores();
 }

or on the reset button

 void OnMouseUp()
 {
     gameController.ResetLevel();
 }

etc. Just really simple function calls.

I am embedding ads in my game - along the bottom of the screen. I am using the AdMob for unity plugin (for iOS / Xcode), and embedding all the proper .m and .h files properly, as per the admob instructions. I don't think there's an issue with how I have things hooked up. In AdMob, I'm using Ad Moderation to show both AdMob and iAds. The ads are all showing up fine in game.

Here's the issue: When you TAP on an iAD ad, it often, instead, triggers the OnMouseUp code on my objects on screen.

Yes, that's right, clicking on an iAd ad, instead triggers the various clicks on sprites in my game. It's totally random. Sometimes the iAd is clicked successfully and shows up just fine, but 50% of the time, some random tap event is triggered elsewhere in my game.

I'm at a loss.. I don't know what could or would cause this. It is ONLY with iAds - the AdMob ads click just fine. I don't even see how iAd could "reach into" my game, which it is on top of, and trigger clicks within items in the game.

anyone have any ideas?