Unity eCPM problem

Hello, we have published our new game yesterday, it’s all good, we had like 27k impressions in 5 hours and over 24k today (half day).
My only problem is that the eCPM for iOS platform is like over 2$, but for Android it’s 0,40-0,55$…
We used same implementation for both iOS and Android.

This is the screenshot from today.

This is the screenshot from yesterday.

Can somebody tell me why is that?
We have about 8k installs (statistics are still not updated) on Android and as you can see we have way more impressions from Android platform than iOS