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Sounds to me like you've got a lot of bot traffic.
I say that because I'm pretty familiar with Adsterra, and they aren't going to ban a publisher over $500 for no reason. I think you don't know how many really big sites use them.
Most ad networks will can you for bot traffic without question. In almost all cases, they will just do it and move on, because pubs like that aren't worth the trouble.
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