AdMob estimated earnings dropped to 0

Unhappy Admob Estimated earnings dropped to 0
Hi, I have created a game for Android if Unity and applied AdMob plugin. I know it’s not very famous game. But my estimated earnings were moving between 1 Kč and 3 Kč (it’s not much, but it’s at least start ). Now, it dropped to exact zero and I don’t know reason. Impressions are still almost the same.

Second issue is that Clicks on Ads are not included. I know for sure people are clicking on it (I saw it on friend’s devices), but on AdMob they aren’t recorded. I didn’t change .apk file so progress should be still the same, or not? Is there any minimal limit of installs of apps or what?

I’ve taken few screenshots.