Unity Ads Problem on android

Hello community. I have a weird problem setting up unity ads on my android device. While the game and adverts work fine on my iOS version, when i build the same game to android it keeps looping unity video and reward video on the beginning of my game. In my code there is not a single call to show add on the start. As i said it works normally on iOs but for some reason android version don't work as expected. Does anyone know possible fix for this? Thank you