Payment less than earnings in old admob !!

i had earnings on my old admob and was waiting for payment, but its weird : the payment being sent is about half what i have earned only for that period , mean until july 31.
any idea whats the problem ?
anybody having the same issue ?
i earned $83.26 and was paid $38.02

It is plausible that they subtracted “unknown location” clicks. Did you have a lot of clicks from unknown location?
This was a problem on the old admob. There should be a couple of threads about unknown location activity on this forum.
Basically admob said that they would remove earnings from such traffic.

maybe because they will pay in 2 months