It could be just that they are playing in another currency which is being converted back to $ in your affiliate account.
All US players in my case.
Just trying to figure out how we can find out how much we have unknowingly lost. We should at least be able to find out what this policy has cost us - that way we can make an informed decision as to whether we wish to promote Rival casinos in the future...
Hopefully, one of the AMs will be able to tell us how we can get this data when we log in to our accounts