This must be so annoying - looks like half of your traffic is from "Empty" zones.
I've just asked our PropellerAds rep about this - will report back when they provide us with more insight.
Amy
Hi Josef
We'd like to take a look at this issue. Please send all these screenshots to our Support team (always online in Live Chat in your account). And after that please send me your account id (email) in PM.
Did you have a talk with your tracker?
Thank you!