Is there income inequality by admob ad types

I had 3 ad type in my application. rewarded ad with the most impressions but somehow even banners earn more than rewarded ads. Rewarded ads impressions 3 times more than interstitial but same earnings.

for the first few weeks, there was no such thing, and then suddenly income declined.

if someone has had a problem before and knows why, can it help me? I suspect I'm producing too many rewarded ads, but I couldn't find any documentation

Thanks for any advice or help

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